Simultaneous determination of organotin compounds in textiles by gas chromatography-flame photometry following liquid/liquid partitioning with tert-butyl ethyl ether after reflux-extraction.
A rapid and relatively clean method for determining six organotin compounds (OtC) in textile goods with a gas chromatograph equipped with a conventional flame photometric detector (GC-FPD) has been developed. After the reflux-extraction to use methanol containing 1% (v/v) of hydrochloric acid, five hydrophobic OtC (e.g. tributyltin: TBT) and slightly less hydrophobic dibutyltin (DBT) could be drawn out through partitioning between the methanolic buffer solution and tert-butyl ethyl ether instead of hazardous dichloromethane, of which usage is provided by the official-methods notified in Japan, and following the ethylation procedure to use sodium tetraethylborate, the OtC were determined with the GC-FPD. The recoveries of DBT, TBT, tetrabutyltin, triphenyltin, dioctyltin, and trioctyltin from textile products (cloth diaper, socks, and undershirt) were 60-77, 89-98, 86-94, 71-78, 85-109, and 70-79% respectively, and their coefficients of variation were 2.5-16.5%. Calibration curves for OtC were linear (0.01-0.20 μg as Sn mL(-1)), and the correlation coefficients were 0.9922-1.0000. Their detection limits were estimated to be 2.7-9.7 n gas Sn g(-1). These data suggested that this method would be applicable to their simultaneous determination. Five retailed textile goods were analyzed by this proposed method, and 0.013-0.65 µg as Sn g(-1) of OtC (e.g. DBT) were determined in three. Moreover, a possibility that various OtC including non-targeted species in textile would be specifically detected by applying the studying speciation-technique of controlling signal intensity-flame fuel gas pressures of the GC-FPD was found.
Environmental Health Department, Nagoya City Public Health Research Institute, 1-11 Hagiyama-cho, Mizuho-ku, Nagoya 467-8615, Japan. Electronic address: t.hamasaki.dr@city.nagoya.lg.jp.
Tetsuo
T
Hamasaki
D002138:Calibration; D052244:Endocrine Disruptors / Q000302:isolation & purification*; D005019:Ethyl Ethers / Q000737:chemistry*; D005410:Flame Ionization; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006801:Humans; D057230:Limit of Detection; D009947:Organotin Compounds / Q000302:isolation & purification*; D052616:Solid Phase Extraction / Q000379:methods*; D013784:Textiles / Q000032:analysis*
D052244:Endocrine Disruptors; D005019:Ethyl Ethers; D009947:Organotin Compounds; C098546:ethyl tert-butyl ether
Dibutyltin; GC-FPD; Household products; Organotin compounds; Speciation; tert-butyl ethyl ether