GB/T 35108-2017 in English

GB/T 35108—2017 Standard Interpretation

Standard Background and Purpose

GB/T 35108—2017 "Determination of Mineral Oil in Mineral Oil Pesticides" is China's authoritative standard for the detection of mineral oil pesticides, and is managed by the National Technical Committee for Pesticide Standardization. The main drafting units of this standard include the Pesticide Testing Institute of the Ministry of Agriculture, the Pesticide Testing Institute of Hebei Province and other authoritative institutions, ensuring its scientificity and practicality.

The purpose of formulating this standard is to standardize the determination methods of key indicators in mineral oil pesticides, including the detection of mineral oil mass fraction, relative normal alkane carbon number range difference and average carbon number and non-sulfonated content. These indicators are of great significance for evaluating the quality and safety of mineral oil pesticides.

Comparison of Standard Frameworks

Interpretation of key technologies

1. Quantitative analysis by gas chromatography

The standard uses gas chromatography (internal standard quantitative method) to determine the mass fraction of mineral oil. Using OV-1701 capillary column and hydrogen flame ionization detector, quantitative analysis is performed using the internal standard di-n-octyl phthalate.

Operation points: Starting temperature 80°C, final temperature 270°C; carrier gas flow rate 1.8 mL/min, split ratio 50:1. This method has the characteristics of good separation effect and high sensitivity, and is suitable for accurate quantification of mineral oil.

2. Program temperature rise technology

The standard uses program temperature rise technology to determine the relative normal alkane carbon number range difference and average value. By drawing a standard working curve, the linear relationship between retention time and carbon number is used for calculation.

Operation points:Use the same chromatographic conditions, and the standard samples include normal alkanes from C12 to C28. This method ensures the accuracy and repeatability of the measurement results.

3. Sulfonation layering method

For the determination of non-sulfonated content, the standard stipulates the use of a sulfonator and a special measuring cylinder for separation, and the non-sulfonated content is calculated by volume ratio.

Operation points:Add 15 mL of sample, shake vigorously for 5 minutes, and record the layer volume after standing for 5 hours. This method is simple and intuitive and is suitable for the detection of refined mineral oil.

Implementation suggestions