GB/T 28125.2-2020Gas analysis—Determination of hazardous materials in air separation process—Part 2:Determination of mineral oil (English PDF)

Foreword

GB/T 28125 "Determination of Hazardous Substances in Gas Analysis and Air Separation Process" is temporarily divided into three parts.

---Part 1: Determination of hydrocarbons;

---Part 2: Determination of mineral oil;

---Part 3: Determination of nitrogen oxides.

This part is Part 2 of GB/T 28125.

This section was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This part of GB/T 28125 specifies the method principles, reagents and materials, instruments and equipment for the determination of mineral oil content in air separation process gases.

Preparation, sampling, determination of suspended oil, determination of steam oil, total mineral oil content, reports and precautions.

This part is applicable to the determination of mineral oil content in oxygen, nitrogen, argon, helium and compressed air in the air separation process. mine The determination range of oil content is 0.001mg/m³~10mg/m³.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 8984 Determination of carbon monoxide, carbon dioxide and hydrocarbons in gases by gas chromatography

3 Terms and definitions

The following terms and definitions apply to this document.

4 Principle of the method

The mineral oil in the gas exists in two forms. suspended oil and steam oil. The sum of the two forms of oil content is the total content of mineral oil.

The gas sample is filtered through a glass fiber filter membrane to filter the suspended oil, and the glass fiber filter membrane with the suspended oil is soaked in tetrachloroethylene to control the oil.

The solution is fully dissolved, and the solution is measured with an infrared spectrophotometer.

The activated carbon tube is used to adsorb the steam oil, and the activated carbon that adsorbs the steam oil is soaked and desorbed with carbon disulfide, and is equipped with hydrogen flame ion The gas chromatography of the chemical detector measures the solution.

5 Reagents and materials

5.1 Perchloroethylene. use 4cm cuvette, air pool as reference, scan between 3300cm-1~2600cm-1, absorbance does not exceed