Simultaneous Determination of Mono-, Di-, and Triphenyltin Compounds in Seawater by Gas Chromatography

Abstract

A gas chromatographic (GC) method for the simultaneous determination of mono-, di-, and triphenyltin compounds at ng// (ppt) levels in seawater is described. These compounds in seawater were simultaneously extracted into dichloromethane as their hydrides, such as monophenyltin trihydride (MPTH), diphenyltin dihydride (DPTH) and triphenyltin hydride (TPTH), converted by sodium borohydride and analyzed by GC with flame photometric detection (GC-FPD). The recoveries of monophenyltin trichloride (MPTC), diphenyltin dichloride (DPTC) and triphenyltin chloride (TPTC) from seawater sample were 75.0-82.4%, 79.4--92.6% and 84.5--91.5%, respectively. The detection limits for this method were 5 ng// for MPTC, 5 ng/l for DPTC and 20 ng// for TPTC. The concentrations of MPTC, DPTC and TPTC in seawater samples collected from Maizuru Bay, Kyoto Prefecture, for a period of one year from June 1989 to June 1990 were found to be N. D. (not detected). t Studies on the Determination of Trace Amounts of Organotin Compounds in Seawat e r and the Behavior of their Compounds in the Marine Environment. X.