Determination of Three Pentachloropropanes in Drinking Water by Headspace-GC and Purge and Trap-GC-MS

Objectives  To develop the analysis method of 3 pentachloropropanes in drinking water by headspace (HS)-GC and purge and trap-GC-MS.

Methods  For HS-GC method, high purity nitrogen was used as carrier gas with oscillation at 70 ℃ for 15 min, Electron capture detector was used, and external standard method was adopted for quantification; for purge and trap-GC-MS method, high purity helium was used as carrier gas, purge was conducted at room temperature, selected ion monitoring mode was used, and internal standard method was adopted for quantification; the detection limit, precision, and accuracy of two method were evaluated.

Results  Three pentachloropropanes could be completely isolated by HS-GC and purge and trap-GC-MS. Both method showed a good linear relationship, and the correlation coefficients were greater than 0.999. The detection limit, recovery, and precision of HS-GC method were (0.005-0.03) μg/L, 86.4%-118%, 1.9%-6.5%, respectively. The detection limit, recovery, and precision of purge and trap-GC-MS were (0.004-0.008) μg/L, 80.5%-112%, 0.9%-5.6%, respectively.

Conclusions  The two method both did well in the qualitative and quantitative analysis of pentachloropropanes in drinking water without significant difference among the determination result of actual samples, which could meet the analysis and determination of pentachloropropanes in drinking water.