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Methods were developed to determine traces of 4,5,6,7-tetrachlorophthalide (fthalide) and 1,4,5,6,7,8,8-heptachloro-2,3-epoxy-2,3,3a,7a-tetrahydro-4,7-methanoindene (heptachlor epoxide) in environmental samples such as river water, sediment and fish. The samples were cleaned up by using convenient disk type solid phase extractors and cartridges and analyzed by GC/MS with selected ion monitoring. Fthalide and heptachlor epoxide in water samples could be determined in the range 0.1–0.3 ng ml −1 with relative standard deviations (RSDs) of 1.0–4.8%. The estimated detection limits were 0.020–0.031 ng ml −1 , 5.1–7.3 ng g −1 and 2.7–4.2 ng g −1 in water, sediment and fish samples, respectively. The recoveries were 96–103, 99–101, 66–85 and 67–77% with RSDs of 4.3–10.2, 2.4–2.5, 4.6–5.2 and 2.1–3.8% in river water, sea water, sediment and fish samples, respectively. |
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