L. Piedra et al., Screening of antifouling pesticides in sea water samples at low ppt levelsby GC-MS and LC-MS, CHROMATOGR, 52(9-10), 2000, pp. 631-638
Studies of various analytical procedures for simultaneous determination of
antifouling pesticides in sea water, based on SPE followed by GC-MS and IC-
MS, have been mode. The main characteristics of these compounds in GO-MS in
both positive and negative modes and in LC-ES-MS were studied. Extraction
of the compounds from filtered water was performed off-line with different
SPE adsorbents using graphitized carbon (Envi-carb) and polymer cartridges
(Isolute ENV+ and Oasis HLB) by passing 600 mL samples through them. Detect
ion was carried out following selected analytical procedures (GC-MS in El a
nd NCI modes) and LC-ES-MS (positive mode). Recoveries ranged from 80 - 95%
except for dichlofluanid and Sea-nine 211 where they were 40 and 46%. In s
pite of this, the low coefficients of variation (< 11%) obtained, were low
enough to consider these recoveries adequately. Limits of detection were at
low part-per-trillon levels in all cases. Finally a six-month pilot study
was carried out at various marinas in the South-East of Spain. Irgarol 1051
and diuron were revealed as the major antifouling agents in this area at c
oncentrations vp to 0.9 and 0.8 <mu>g L-1 respectively.