GC-MS Determination of 9 Organotins in Latex Products

The sample (2.000 0 g) was extracted ultrasonically with acetone of 20 mL for 45 min, and the extract was made its volume up to 25.0 mL with acetone. The above solution of 1.0 mL was taken, and acetic acid buffer solution (pH 4.0) of 5 mL and 20 g·L^-1 sodium tetraethylborate solution of 2 mL were added. After ultrasonic reaction for 45 min, hexane of 2 mL was added and then the mixture was mixed whirly for 30 s. After dehydration and filtration of the upper layer organic phase, 9 organotins were separated by gas chromatography (GC) with DB-35MS column as the stationary phase.EI and SIM were adopted in MS analysis. Linear relationships between peak area and mass concentration of 9 organotins were found in the range of 0.8-50 mg·L^-1, with detection limits (3S/N) in the range of 0.18-0.87 mg·kg^-1. Tests for recovery were made by standard addition method, giving results in the range of 82.0%-105%, with RSDs (n=6) all less than 7.0%.