Sign In |Help & Support
ALL SECTORS
  • ALL SECTORS
  • GB(National Standard)
  • CB(Shipping)
  • CECS(Engineering Construction)
  • CJ(Urban Construction)
  • CY(News and Publication)
  • DB(Provincial Standard)
  • DL(Electricity & Power)
  • DZ(Geology & Mineralogy)
  • FZ(Spinning & Textile)
  • GA(Public Security)
  • HB(Aviation)
  • HG(Chemical Industry)
  • HJ(Environmental Protection)
  • JB(Machinery)
  • JC(Building Materials)
  • JG(Building & Construction)
  • JJ(Metering)
  • JT(Highway & Transportation)
  • LY(Forestry)
  • MT(Coal)
  • NB(Energy)
  • NY(Agriculture)
  • QB(Light Industry)
  • QC(Automobile & Vehicle)
  • QJ(Aerospace)
  • SH(Petrochemical)
  • SJ(Electronics)
  • SL(Water Resources)
  • SN(Commodity Inspection)
  • SY(Oil & Gas)
  • TB(Railway & Train)
  • YB(Ferrous Metallurgy)
  • YC(Tobacco)
  • YD(Telecommunication)
  • YY(Medical Device)
Database: 365,228(8 Aug 2026)

Atomic Absorption and UV Spectroscopy

Atomic Absorption and UV Spectroscopy, Total:200 items.

The international standard classification for "Atomic Absorption and UV Spectroscopy" includes: Chemical reagents , Analytical chemistry in general , Woodworking machines , Jewellery , Physicochemical methods of analysis , Chemical technology (Vocabularies) , Water quality in general , Cadmium, cobalt and their alloys , Water quality , Animal feeding stuffs , Education , Chemical analysis of metals .

The Chinese standard classification for "Atomic Absorption and UV Spectroscopy" includes: Chemical reagent in general , Electrochemical, thermochemistry and optical profile type analyzer , Basic standards and general methods , Other non-metal ore , Synthetic materials in general , Analysis methods for toxic substances in atmosphere , Heavy metals and their alloys analysis method , Analysis methods for toxic substances in water , Cosmetics , Electron optics and other physical optics instrument , Livestock and poultry feed and additive , chromatograph , Special instruments for teaching , Semimetal and semiconductor material analysis method .


General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

  • GB/T 21187-2007 Atomic absorption spectrophotometer
  • GB 11905-1989 Water quality - Determination of calcium and magnesium-Atomic absorption spectrophotometric method
  • GB/T 2129-1980 Determination of lead content in cadmium--Atomic absorption spectrophotometric method
  • GB/T 7468-1987 Water quality; Determination of total mercury; Cold atomic absorption spectrophotometry
  • GB/T 4470-1998 Analytical spectroscopic methods-Flame emission,atomic absorption and atomic fluorescence-Vocabulary
  • GB/T 11912-1989 Water quality--Determination of nickel--Flame atomic absorption spectrometric method
  • GB/T 11905-1989 Water quality--Determination of calcium and magnesium--Atomic absorption spectrophotometric method
  • GB/T 24370-2009 Characterization of CdSe quantum dot nanocrystals - UV - Vis absorption spectroscopy
  • GB/T 9721-2006 Chemical reagent - General rules for the molecular absorption spectrophotometry (ultraviolet and visible)
  • SPC GB/T 37186-2018 Gas analysis -- Determination of sulfur dioxide and nitrogen oxides -- Ultraviolet differential optical absorption spectroscopy (TEXT OF DOCUMENT IS IN CHINESE)
  • GB/T 15337-2008 General rules for atomic absorption spectrometric analysis
  • GB/T 15506-1995 Water quality--Determination of barium--Atomic absorption spectrometry
  • GB/T 21883-2025 Determination of UV Absorption and Fluorescence Intensity of Fluorescent Whitening Agents
  • GB/T 9721-1988 Chemical reagent-General rules for the molecular absorption spectrophotometry(ultraviolet and visible)
  • GB/T 2131-1980 Determination of zinc content in cadmium--Atomic absorption spectrophotometric method
  • GB/T 42645-2023 Gems testing—Ultraviolet-visible absorbtion spectroscopy
  • GB/T 11907-1989 Water quality--Determination of silver--Flame atomic absorption spectrophotometric method
  • GB/T 15337-1994 General rules for atomic absorption spectrometric analysis
  • GB/T 24370-2021 Nanotechnologies—Characterization of cadmium chalcogenide colloidal quantum dot—UV-Vis absorption spectroscopy
  • GB 7468-1987 Determination of Total Mercury in Water Quality by Cold Atomic Absorption Spectrophotometry
  • GB/T 24369.1-2009 Characterization of gold nanorods—Part 1:UV-Vis-NIR absorption spectroscopy
  • GB 9721-1988 Molecular Absorption Spectrophotometry of Chemical Reagents General Rules (Ultraviolet and Visible Parts)

Professional Standard - Light Industry

  • QB/T 2334-1997 Method for the Qualitative Determination of Ultraviolet Absorbents in Cosmetics - Ultraviolet Spectrophotometry

National Metrological Verification Regulations of the People's Republic of China

Professional Standard - Machinery

Professional Standard - Agriculture

Professional Standard - Education

  • JY/T 0570-2020 General rules for ultraviolet and visible absorption spectrometry
  • JY/T 023-1996 General rules for graphite furnace atomic absorption spectrophotometry
  • JY/T 0565-2020 General rules for electrothermal atomic absorption spectrometry
  • JY/T 022-1996 General rules for ultraviolet and visible absorption spectrometry

Taiwan Provincial Standard of the People's Republic of China

  • CNS 11206-2002 Iron and steel─Methods for atomic absorption spectrometric analysis
  • CNS 11209-1995 General Rules for Chemical Analysis by Atomic Absorption Spectrophotometry

Professional Standard - Medicine

  • YY 91060-1999 Vocabulary of biochemical instruments. UV-VIS spectrophotometry

National Metrological Technical Specifications of the People's Republic of China

  • JJF 1574-2016 Program of Pattern Evaluation of Atomic Absorption Spectrophotometers

Professional Standard - Non-ferrous Metal

  • YS/T 227.8-1994 Determination of magnesium and sodium contents in tellurium--Atomic absorption spectrophotometric method
  • YS/T 536.4-2009 Methods for chemical analysis of bismuth - Determination of silver content - Flame atomic absorption spectrophotometric method and electrothermal atomic absorption spectrometric method

Ministry of Ecology and Environment of the People's Replublic of China

  • GB 11907-1989 Water quality - Determination of silver-Flame atomic absorption spectrophotometric method
  • GB 11912-1989 Water quality-Determination of nickel-Flame atomic absorption spectrometric method

Professional Standard - Environmental Protection

  • HJ 757-2015 Water quality - Determination of chromium - Flame atomic absorption spectrometry
  • HJ 1397-2024 Water quality-Determination of strontium-Flame atomic absorption spectrophotometry
  • HJ 957-2018 Water quality - Determination of cobalt - Flame atomic absorption spectrometry
  • HJ 1046-2019 Water quality—Determination of antimony—Flame atomic absorption spectrometry
  • HJ 597-2011 Water quality—Determination of Total mercury—Cold atomic absorption spectrophotometry
  • HJ 603-2011 Water quality- Determination of barium- Flame atomic absorption spectrophotometry

Professional Standard - Chemical Industry

  • HG/T 2954~2955-2008 Standard writing format for atomic absorption spectroscopic analysis method Standard writing format for molecular absorption spectroscopic analysis method

Spanish Association for Standardization (UNE)

  • UNE 55047:1973 FATS. SPECTROPHOTOMETRIC MEASURE OF ABSORPTION IN THE ULTRAVIOLET AREA.
  • UNE 84124:2000 Cosmetic raw materials. Determination of UV-filters by spectrophotometric absorbance.
  • UNE 77401:1992 ECOTOXICOLOGY. DETERMINATION OF UV-VIS ABSORPTION SPECTRA.
  • UNE 84124:2014 Cosmetic raw materials. Determination of UV-filters by spectrophotometric absorbance.
  • UNE 37-254-1986 Determination of lead and zinc content. Atomic absorption spectrophotometry
  • UNE 37-253-1986 Determination of lead and copper content. Atomic absorption spectrophotometry
  • UNE 37-252-1986 Determination of lead and bismuth content. Atomic absorption spectrophotometry
  • UNE 37-256-1986 Determination of lead and antimony content. Atomic absorption spectrophotometry
  • UNE 37-255-1986 Determination of lead and iron content. Atomic absorption spectrophotometry
  • UNE 37-254-1987 Determination of lead and zinc content. Atomic absorption spectrophotometry
  • UNE-EN 16197:2013 Fertilizers - Determination of magnesium by atomic absorption spectrometry

Korean Agency for Technology and Standards (KATS)

  • KS M 9102-1996 Water quality-Determination of total mercury by flameless atomic absorption spectrometry(Method after pretreatment with ultraviolet radiation)
  • KS D 2553-2015 Tantalum-Method for atomic absorption spectrometric analysis
  • KS M 9102-1996(2001) WATER QUALITY-DETERMINATION OF TOTAL MERCURY BY FLAMELESS ATOMIC ABSORPTION SPECTROMETRY(METHOD AFTER PRETREATMENT WITH ULTRAVIOLET RADITION)
  • KS E 3030-1982 Atomic absorption spectrochemical analysis for iron ores
  • KS E 3030-2007(2012) Atomic absorption spectrochemical analysis for iron ores
  • KS D 2553-2015(2020) Tantalum-Method for atomic absorption spectrometric analysis
  • KS D 1659-2019 Methods for atomic absorption spectrophotometric analysis of iron and steel
  • KS D 2568-2024 Tantalum-Method for atomic absorption spectrometric analysis
  • KS D 2568-2019 Tantalum-Method for atomic absorption spectrometric analysis
  • KS D 2553-2025 Tantalum — Method for atomic absorption spectrometric analysis
  • KS D 2553-2020 Tantalum-Method for atomic absorption spectrometric analysis
  • KS D 2568-2008 Tantalum-Method for atomic absorption spectrometric analysis
  • KS M 0016-2010 General rules for atomic absorption spectrochemical analysis
  • KS D 1659-2024 Methods for atomic absorption spectrophotometric analysis of iron and steel
  • KS M ISO 6955-2016(2021) Analytical spectroscopic methods-Flame emission,atomic absorption, and atomic fluorescence-Vocabulary
  • KS M 0016-2010(2020) General rules for atomic absorption spectrochemical analysis
  • KS M ISO 6955-2016 Analytical spectroscopic methods-Flame emission,atomic absorption, and atomic fluorescence-Vocabulary
  • KS M 0016-1995 General rules for atomic absorption spectrochemical analysis
  • KS M ISO 6955:2016 Analytical spectroscopic methods-Flame emission,atomic absorption, and atomic fluorescence-Vocabulary
  • KS M 0016-2010(2025) General rules for atomic absorption spectrochemical analysis
  • KS D 2553-2015(2025) Tantalum — Method for atomic absorption spectrometric analysis
  • KS D 1659-2008(2024) Methods for atomic absorption spectrophotometric analysis of iron and steel
  • KS D 1659-1993 Methods for atomic absorption spectrophotometric analysis of iron and steel
  • KS D 1659-2008(2019) Methods for atomic absorption spectrophotometric analysis of iron and steel
  • KS D 1659-2008 Methods for atomic absorption spectrophotometric analysis of iron and steel
  • KS M ISO 6955-2021 Analytical spectroscopic methods-Flame emission,atomic absorption, and atomic fluorescence-Vocabulary
  • KS E 3030-2007 Atomic absorption spectrochemical analysis for iron ores
  • KS E 3030-2017 Atomic absorption spectrochemical analysis for iron ores
  • KS M ISO 6955:2011 Analytical spectroscopic methods-Flame emission,atomic absorption, and atomic fluorescence-Vocabulary
  • KS M 0016-2020 General rules for atomic absorption spectrochemical analysis
  • KS I ISO 9174-2024 Water quality — Determination of total chromium — Atomic absorption spectrometric methods
  • KS I ISO 5961:2006 Water quality-Determination of cadmium by atomic absorption spectrometry
  • KS D 1679-1993 Methods for atomic absorption spectrometric analysis of aluminium and aluminium alloys
  • KS M 9104-1996 Water quality-Determination of cadmium by atomic absorption spectrometry
  • KS D 1679-2025 Methods for atomic absorption spectrometric analysis of aluminium and aluminium alloys

Indonesia Standards

  • SNI 13-6180-1999 Procedure for optimization of flame Atomic Absorption Spectrophotometer (AAS)
  • SNI 06-2428-1991 Air, Metode pengujian atom dengan spektrofotometer serapan atom
  • SNI 06-6992.4-2004 Sediment - Part 4: Test methods of cadmium (Cd) with acid destruction by atomic absorption spectrophotometers (AAS)
  • SNI 6989.4:2009 Water and wastewater - Part 4: Method for the determination of iron (Fe) by atomic absorption spectrometry (flame atomic absorption spectrometry)
  • SNI 13-4694-1998 Composition analysis of coal ash by atomic absorption spectrometry
  • SNI 06-6596-2001 Water treatment for metal analysis by atomic absorption spectrophotometers
  • SNI 06-6992.6-2004 Sediment - Part 6: Test methods of nickel (Ni) with acid destruction by atomic absorption spectrophotometers (AAS)

Standard Association of Australia (SAA)

  • AS 2134.1:1988 Recommended practice for chemical analysis by atomic absorption spectrometry - Flame atomic absorption spectrometry
  • AS 2134.3:1994(R2016) Recommended practice for chemical analysis by atomic absorption spectrometry - Vapour generation atomic absorption spectrometry
  • AS 2134.3:1994 Recommended practice for chemical analysis by atomic absorption spectrometry - Vapour generation atomic absorption spectrometry
  • AS 2134.1:1999(R2016) Recommended practice for chemical analysis by atomic absorption spectrometry - Flame atomic absorption spectrometry
  • AS 2134.1:1999 Recommended practice for chemical analysis by atomic absorption spectrometry - Flame atomic absorption spectrometry

GCC Standardization Organization

  • OS GSO ASTM D2008:2024 Standard Test Method for Ultraviolet Absorbance and Absorptivity of Petroleum Products
  • BH GSO ASTM D2008:2024 Standard Test Method for Ultraviolet Absorbance and Absorptivity of Petroleum Products
  • GSO ISO/TS 17466:2017 Use of UV-Vis absorption spectroscopy in the characterization of cadmium chalcogenide colloidal quantum dots

Bureau of Indian Standards

  • IS 9958-1981 Determination of Zinc by Atomic Absorption Spectrophotometry
  • IS 12491-1988 Method for determination of magnesium by atomic absorption spectrophotometry
  • IS 12042-1987 Method for determination of molybdenum using atomic absorption spectrophotometer
  • IS 12074-1987 Method for determination of lead using atomic absorption spectrophotometer
  • IS 12122-1987 Method for determination of nickel by atomic absorption spectrophotometry
  • IS 11124-1984 Method for determination of arsenic by atomic absorption spectrophotometry
  • IS 12046-1987 Method for determination of manganese by atomic absorption spectrophotometry
  • IS 12041-1987 Method For Determination of Mercury by Atomic Absorption Spectrophotometer
  • IS 11123-1984 Method for determination of copper by atomic absorption spectrophotometry
  • IS 10614-1983 Method for determination of sodium and potassium by atomic absorption spectrophotometry

International Organization for Standardization (ISO)

  • ISO 5666-2:1983 Water quality; Determination of total mercury by flameless atomic absorption spectrometry; Part 2: Method after pretreatment with ultraviolet radiation
  • ISO 6323-1:2024 Workplace air — Determination of arsenic and arsenic compounds by electrothermal atomic absorption spectrometry — Part 1: Arsenic and arsenic compounds, except arsine by ET-AAS
  • ISO/TS 17466:2015 Use of UV-Vis absorption spectroscopy in the characterization of cadmium chalcogenide colloidal quantum dots
  • ISO 5961:1994 Water quality; determination of cadmium by atomic absorption spectrometry

Austrian Standards

  • ONORM ISO 5666 Teil.2:1984 Water quality; determination of total mercury by flameless atomic absorption spectrometry; method after pretreatment with ultraviolett radiation

German Institute for Standardization

  • DIN EN ISO 3656 A1 E:2016-10 Determination of ultraviolet absorption of animal and vegetable fats and oils. Specific ultraviolet extinction coefficients. Part 1
  • DIN 51401 Beiblatt 1:2017-07 Atomic absorption spectrometry (AAS) and atomic fluorescence spectrometry (AFS) - Vocabulary; Supplement 1: Explanations
  • DIN 51401 Beiblatt 1:2013-08 Atomic absorption spectrometry (AAS) and atomic fluorescence spectrometry (AFS) - Vocabulary; Supplement 1: Explanations
  • DIN 51401:2016 Atomic absorption spectrometry (AAS) and atomic fluorescence spectrometry (AFS) - Vocabulary
  • DIN 51401 E:2015-10 Atomic absorption spectrometry (AAS) and atomic fluorescence spectrometry (AFS) - Vocabulary
  • DIN 51401:2016-11 Atomic absorption spectrometry (AAS) and atomic fluorescence spectrometry (AFS) - Vocabulary
  • DIN 51401:2010-07 Atomic absorption spectrometry (AAS) - Vocabulary
  • DIN 51401 Beiblatt 1 E:2017-02 Atomic absorption spectrometry (AAS) and atomic fluorescence spectrometry (AFS) - Vocabulary; Supplement 1: Explanations
  • DIN 51401:2016-04 Atomic absorption spectrometry (AAS) and atomic fluorescence spectrometry (AFS) - Vocabulary
  • DIN EN ISO 3656:2002-07 Animal and vegetable fats and oils - Determination of ultraviolet absorbance expressed as specific UV extinction (ISO 3656:2002)
  • DIN 51401-1:2001-12 Atomic absorption spectrometry (AAS) - Part 1: Terms
  • DIN EN 16197:2013-01 Fertilizers - Determination of magnesium by atomic absorption spectrometry; German version EN 16197:2012
  • DIN 51401-1 E:2009 Draft Document - Atomic absorption spectrometry - Part 1: Terms
  • DIN 51401:2010 Atomic absorption spectrometry (AAS) - Vocabulary

Japanese Industrial Standards Committee (JISC)

  • JIS H 1683:2002 Tantalum -- Method for atomic absorption spectrometric analysis
  • JIS G 1257:1994 Iron and steel -- Methods for atomic absorption spectrometric analysis

Finnish Standards Institute

  • SFS-EN ISO 3656:2011 Animal and vegetable fats and oils. Determination of ultraviolet absorbance expressed as specific UV extinction (ISO 3656:2011)

British Standards Institution (BSI)

  • PD ISO/TS 17466:2015 Use of UV-Vis absorption spectroscopy in the characterization of cadmium chalcogenide colloidal quantum dots
  • BS PD ISO/TS 17466:2015 Use of UV-Vis absorption spectroscopy in the characterization of cadmium chalcogenide colloidal quantum dots
  • BS ISO 6323-1:2024 Workplace air. Determination of arsenic and arsenic compounds by electrothermal atomic absorption spectrometry - Arsenic and arsenic compounds, except arsine by ET-AAS
  • BS EN ISO 3656:2011 Animal and vegetable fats and oils. Determination of ultraviolet absorbance expressed as specific UV extinction
  • PD CEN/TS 16197:2011 Fertilizers - Determination of magnesium by atomic absorption spectrometry
  • DD CEN/TS 16197:2011 Fertilizers. Determination of magnesium by atomic absorption spectrometry
  • BS EN ISO 5961:1995 Water quality. Determination of cadmium by atomic absorption spectrometry
  • BS EN ISO 5961:1995(2008)*BS 6068-2.21:1995 Water quality — Determination of cadmium by atomic absorption spectrometry

Danish Standards Foundation

  • DANSK DS/ISO 6323-1:2024 Workplace air – Determination of arsenic and arsenic compounds by electrothermal atomic absorption spectrometry – Part 1: Arsenic and arsenic compounds, except arsine by ET-AAS
  • DANSK DS/ISO/TS 17466:2015 Use of UV-Vis absorption spectroscopy in the characterization of cadmium chalcogenide colloidal quantum dots
  • DANSK DS/EN ISO 5961:1995 Water quality - Determination of cadmium by atomic absorption spectrometry
  • DS 284:1988 Water quality - Chromium - Atomic absorption spectrometry in flame
  • DS/EN ISO 5961:1996 Water quality - Determination of cadmium by atomic absorption spectrometry
  • DS/EN 16197:2012 Fertilizers - Determination of magnesium by atomic absorption spectrometry
  • DANSK DS/EN 16197:2012 Fertilizers - Determination of magnesium by atomic absorption spectrometry

Bureau of Philippine Standards

  • PNS ISO/TS 17466:2021 Use of UV-Vis absorption spectroscopy in the characterization of cadmium chalcogenide colloidal quantum dots

Association Francaise de Normalisation

  • T01-040:1982 Analytical spectroscopic methods. Flame emission, atomic absorption and atomic fluorescence. Vocabulary.
  • NF EN 1233:1996 Water quality - Chromium dosage - Atomic absorption spectrometry methods
  • NF EN ISO 5961:1995 Water quality - Cadmium determination by atomic absorption spectrometry
  • NF EN 16197:2013 Fertilizers - Magnesium determination by atomic absorption spectrometry

European Committee for Standardization (CEN)

  • prEN 25666-2-1992 Water quality; determination of total mercury by flameless atomic absorption spectrometry; part 2: method after pretreatment with ultraviolet radiation (ISO 5666-2:1983)

American Water Works Association (AWWA)

  • AWWA WQTC64141 Comparison between the UV Action Spectrum of Bacillus subtilis Spores and the Standard DNA Absorbance Spectrum

Portuguese Institute of Quality

  • NP 970-1986 Edible fats and oils. UV absorbance
  • NP 1919-1985 Raw materials for the blowing industry. sand. Determination of calcium content (atomic absorption spectrophotometry)
  • NP 1917-1985 Raw materials for the blowing industry. sand. Determination of magnesium content (atomic absorption spectrophotometry)
  • NP 1916-1985 Raw materials for the glass industry. sand. Determination of magnesium content (atomic absorption spectrophotometry)
  • NP 1914-1985 Raw materials for the blowing industry. sand. Determination of iron content (atomic absorption spectrophotometry)
  • NP 1918-1985 Raw materials for the blowing industry. sand. Determination of chromium content (atomic absorption spectrophotometry)

Czech Standards Institute (UNMZ)

  • CSN 75 7400-1998 Water quality - Determination of silver by atomic absorption spectrometric methods
  • CSN 42 0635 Cast.14-1987 Chemical analysis of non-ferrous metals and alloys. Lead. Determination of magnesium by the atomic absorption method
  • CSN 42 0635 Cast.16-1987 Chemical analysis of non-ferrous metals and alloys. Lead. Determination of calcium by the atomic absorption method
  • CSN 42 0647 Cast.8-1989 Chemical analysis of non-ferrous metals and alloys. Tungsten. Determination of calcium by the atomic absorption method
  • CSN 42 0647 Cast.9-1989 Chemical analysis of non-ferrous metals and alloys. Tungsten analysis. Determination of magnesium by atomic absorption method
  • CSN 42 0646 Cast.8-1989 Chemical analysis of non-ferrous metals and alloys. Molybdenum. Determination of magnesium by the atomic absorption method
  • CSN 42 0640 Cast.9-1982 Chemical analysis of non-ferrous metals and alloys. Nickel. Determination of magnesium by the atomic absorption method
  • CSN 42 0646 Cast.7-1989 Chemical analysis of non-ferrous metals and alloys. Molybdenum. Determination of calcium by the atomic absorption method
  • CSN EN 29658-1994 Steel - Determination of aluminium content - Flame atomic spectrometric method

American Society for Testing and Materials (ASTM)

Quality and Standards Authority of Ethiopia (QSAE)

  • ES 401-2000 Determination of sodium content of fertilizers by atomic absorption spectrophotometry

Ente Nazionale Italiano di Unificazione

  • UNI EN 1233:1999 Water quality - Determination of chromium - Atomic absorption spectrometric methods

Standards Norway

  • NS 9462-2006 Water quality Determination of UV-absorbance
  • NS-EN 16197:2012 Fertilizers - Determination of magnesium by atomic absorption spectrometry
  • SN-CEN/TS 16197:2011 Fertilizers — Determination of magnesium by atomic absorption spectrometry

The Directorate General of Specifications and Metrology (DGSM)

  • OS GSO 2083:2010 Determination of mercury in fish by flameless atomic absorption spectrophotometric method

Swedish Institute for Standards

  • SS-EN 16197:2012 Fertilizers - Determination of magnesium by atomic absorption spectrometry

Asociación Española de Normalización (AENOR)

Gosstandart of Russia

  • GOST 9519.3-1977 Lead-calcium bearing alloys. Method of atomic-absorbing spectral analysis