| Autor: |
Gomyo, Takeshi, Ozawa, Michihiro, Kobayashi, Shigeru |
| Zdroj: |
Analytical Sciences; October 1992, Vol. 8 Issue: 5 p687-690, 4p |
| Abstrakt: |
An analytical method for determining the total content of fungicides carbendazim (MBC, methyl benzimidazole-2-yl-carbamate), benomyl (methyl l-(butylcarbamoyl)benzimidazole-2-yl-carbamate) and thiophanate-methyl (dimethyl 4,4’-(o-phenylene)bis(3-thioallophanate)) in water has been developed. The latter two are known to be converted to MBC in the environment. A water sample (100 ml) was mixed with potassium dihydrogenphosphate and disodium hydrogenphosphate (pH 6.8±0.2) and then refluxed for 1 h. By this reaction the fungicides were quantitatively converted to MBC. An aliquot (10 ml) of the reaction mixture was injected into a high-performance liquid chromatograph equipped with a column-switching apparatus and a thermospray mass spectrometer. The detection limit was 0.02 ppb equivalent as MBC. The recoveries of benomyl, carbendazim and thiophanate-methyl fortified in water at a fortification level of 0.05 ppb ranged from 85 to 95%. |
| Databáze: |
Supplemental Index |
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