Feasibility of Methanol as an Internal Standard Solvent in the Detection of Grease Solvent Residues
In order to improve the detection efficiency,methanol was used to replace N,N-dimethylacetamide as the internal standard solvent in the GB 5009.262-2016.The feasibility of methanol as an internal standard solvent was verified by analyzing the linear correlation of the standard curve and detecting the accuracy,stability and statistical difference with the national standard method.The results showed that when methanol was used as the solvent for the internal standard n-heptane,the standard curve linearity was better than that of N,N-dimethylacetamide,and the recovery rate was 92%to 105%.The F=0.005 8 and t=0.64 of the two methods were less than the critical values.The coefficient of variation of the results of multiple replicates was lower than 5%.Therefore,there was no significant difference between the detection results of the two methods in the determination of oil solvent residues,and methanol could be used as a solvent for the internal standard n-heptane in the determination of solvent residues.
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