HJ 1051-2019 in English
VALIDSoil—Determination of petroleum oil—Infrared spectrophotometry
- Issued on:2019-10-24
- Implemented on:2020-04-24
- File Format:PDF
- Delivery:Via email within 1~3 business days
$185.00
本标准规定了测定土壤中石油类的红外分光光度法。
本标准适用于土壤中石油类的测定。
当取样量为10g,提取液体积为50ml，使用40mm石英比色皿时，方法检出限为4mg/kg，测定下限为16mg/kg。
Introduction
Standard Development Background and Technology Evolution
In order to implement the requirements of the Soil Pollution Prevention and Control Law, the Ministry of Ecology and Environment issued the HJ 1051-2019 standard in 2019, establishing the infrared detection method for petroleum pollution in soil for the first time. Compared with the traditional gravimetric method and gas chromatography, this method has the characteristics of high detection efficiency and strong specificity of the infrared spectrophotometer, filling the technical gap in the standardized detection of petroleum in soil in my country.
Core principle of the method
Petroleum substances in the soil were extracted by tetrachloroethylene, and polar interferences were removed by magnesium silicate adsorption column. The absorbance was measured in the characteristic infrared band (2930 cm-1, 2960 cm-1, 3030 cm-1), and the content was calculated based on the correction factor. The key technical parameters are as follows:
| Detection index | Detection limit | Determination lower limit | Linear range |
|---|---|---|---|
| Total amount of petroleum | 4 mg/kg | 16 mg/kg | 16-5000 mg/kg |
Key operation process
- Sample pretreatment: After 10g of sample is dehydrated with anhydrous sodium sulfate, it is extracted with 40ml tetrachloroethylene in two oscillations
- Purification treatment: The extract passes through a magnesium silicate adsorption column (80mm filling height) to remove interference from animal and vegetable oils
- Instrumental analysis: 40mm quartz cuvette was used to measure the absorbance values of three characteristic bands
Key points of quality control
Case: When a laboratory tested the contaminated soil of an oil refinery, the following quality control measures were taken to ensure data reliability:
- Blank test was carried out for each batch of samples (result <4mg/kg)
- Relative deviation of parallel samples was controlled at 18%
- The spike recovery rate reached 85.3%
- Regular verification of correction factor (error <8%)
Implementation suggestions
1. Safety protection: Tetrachloroethylene should be operated in a fume hood, equipped with a gas mask and corrosion-resistant gloves
2. Equipment calibration: It is recommended to verify the correction factor with standard solutions of n-hexadecane, isooctane and benzene every week
3. Interference elimination: For soils with high organic matter, the dosage of magnesium silicate needs to be increased to 10g
4. Data reporting: The results are retained to one decimal place (consistent with the method detection limit)
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