To determinate the concentration of bacterial endotoxin in proficiency testing samples and analyze the matters needing attention in the inspection process.According to the method of ChP 2022.Vol Ⅳ:1143.The kinetic turbidimetric method of photometric determination of bacterial endotoxin.Establish a standard curve of bacterial endotoxin test.The optimal dilution ratio and bacterial endotoxin content were determined by pre-experiment.The optimal dilution ratio was selected to determine the bacterial endotoxin content in the samples for three independent and parallel tests.The linear range of bacterial endotoxin was 0.0625～1.0 EU/mL.The standard curve is LgT=2.8059+(-0.28966LgC)(|r|=0.9982).The endotoxin test wasnt interfered by 1000 times diluted solution.The recovery rate of bacterial endotoxin was 50%～200%.The results of T1,T2 and T3 were 83.80 EU/mL,82.70 EU/mL and 83.00 EU/mL.The kinetic turbidimetric method is reliable,accurate and stable for the proficiency testing samples.
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