GB/T 7686-2016 in English
VALIDGeneral method for determination of arsenic content of chemical products
- Issued on:2016-12-13
- Implemented on:2017-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 7686-2016化工产品中砷含量测定的通用方法》由TC63（全国化学标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
Introduction
Overview of GB/T7686-2016 Standard
GB/T7686-2016 "General Method for Determination of Arsenic Content in Chemical Products" is an important testing standard in my country's chemical industry, used to standardize the determination method of arsenic content in chemical products. This standard replaces the old version of GB/T7686-2008, introduces more advanced analytical technology, and optimizes reagents, instruments and operating procedures.
Main determination methods
This standard provides two main methods for determining arsenic content:
- Diethyldithiocarbamate silver photometry: Applicable to the determination of solutions with arsenic content in the range of 1μg~20μg.
- Atomic fluorescence spectrophotometry: Applicable to the determination of solutions with arsenic content in the range of 0.005μg~2.5μg.
Comparison table of standard frameworks
| Detection method | Scope of application | Sensitivity | Instrument requirements | Standard updates |
|---|---|---|---|---|
| Diethyldithiocarbamate silver photometry | 1μg~20μg arsenic content | High sensitivity, low detection limit | Spectrophotometer (540nm wavelength) | New absorption liquid formula |
| Atomic fluorescence spectrophotometry | 0.005μg~2.5μg arsenic content | Ultra-trace detection capability | Atomic fluorescence spectrophotometer (arsenic hollow cathode lamp) | New interference elimination method |
Technical details and application cases
Principle of silver diethyldithiocarbamate spectrophotometry
In a hydrochloric acid medium, zinc reduces arsenic to generate arsenic hydrogen, which is introduced into a silver diethyldithiocarbamate solution to form purple-red colloidal silver. The absorbance value at a wavelength of 540nm is measured by a spectrophotometer, and a standard curve is established for quantitative analysis.
Principle of atomic fluorescence spectrophotometry
In the presence of thiourea-ascorbic acid, pentavalent arsenic is reduced to trivalent arsenic. Potassium borohydride reduces arsenic to arsenic hydrogen, which is loaded into an atomizer through argon gas and decomposed into atomic arsenic, which excites characteristic wavelength fluorescence for quantitative analysis.
Recommendations for the implementation of the standard
- Laboratories should select appropriate methods (diethyldithiocarbamate silver photometry or atomic fluorescence photometry) according to the test requirements.
- Prepare reagents and calibrate instruments in strict accordance with the standard requirements to ensure test accuracy.
- Establish a complete quality control system, including blank tests, standard curve drawing and result verification.
- Regularly maintain and calibrate instruments to ensure long-term stable operation.
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