Precautions for determining moisture in filter oil of oil filter by gas chromatography
2018/5/17 Viewers:
When determining moisture in filter oil of gas filter by gas chromatography, we should pay attention to the following matters.
(1) requirements for gas chromatograph. To achieve rapid and accurate determination of moisture content in oil, the gas chromatograph adopted should meet the following requirements:
(2) the detection sensitivity is high, and the minimum detection concentration of water content (direct method) in the oil should be less than 0.5ppm. The instrument stability is good, the instrument noise is less than or equal to 0.005mV., the baseline drift and instability are less than or equal to 0.05ppmV/h..
(3) equipped with a special vaporization sampling device suitable for insulating oil, the vaporization speed of the oil in the oil is fast and the vaporization rate is high.
(4) The gas path system is reasonable, which can minimize the pollution of oil vapor to chromatographic columns and other gas path parts, and reduce the adsorption capacity of water as far as possible.
(2) when the working curve is done, the sample size of the n-heptane sample should be at least five different sample sizes, and each volume should be tested in parallel, and the relative deviation of the peak height is not more than 3%.
(3) when using n-heptane as standard sample at room temperature. It is best to take insulation measures, temperature fluctuation is not greater than + 1C.
(4) for each startup test, the work curve should be corrected by single point. If the relative error exceeds 5%., the working curve should be redone.
(5) at least two parallel tests should be done for each sample, and the relative deviation of the peak height should not exceed 3%.
(1) requirements for gas chromatograph. To achieve rapid and accurate determination of moisture content in oil, the gas chromatograph adopted should meet the following requirements:
(2) the detection sensitivity is high, and the minimum detection concentration of water content (direct method) in the oil should be less than 0.5ppm. The instrument stability is good, the instrument noise is less than or equal to 0.005mV., the baseline drift and instability are less than or equal to 0.05ppmV/h..
(3) equipped with a special vaporization sampling device suitable for insulating oil, the vaporization speed of the oil in the oil is fast and the vaporization rate is high.
(4) The gas path system is reasonable, which can minimize the pollution of oil vapor to chromatographic columns and other gas path parts, and reduce the adsorption capacity of water as far as possible.
(2) when the working curve is done, the sample size of the n-heptane sample should be at least five different sample sizes, and each volume should be tested in parallel, and the relative deviation of the peak height is not more than 3%.
(3) when using n-heptane as standard sample at room temperature. It is best to take insulation measures, temperature fluctuation is not greater than + 1C.
(4) for each startup test, the work curve should be corrected by single point. If the relative error exceeds 5%., the working curve should be redone.
(5) at least two parallel tests should be done for each sample, and the relative deviation of the peak height should not exceed 3%.
- Pre：Cleaning treatment of electrol 2018/5/17
- Next：Matters needing attention in d 2018/5/17