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J.Health Sci., 50(2), 142-147, 2004
Water Content Using Karl-Fisher Aquametry and Loss on Drying
Determinations Using Thermogravimeter for Pesticide
Standard Materials
Kimihiko Yoshii* and Yasuhide Tonogai
Division of Food Chemistry, Osaka Branch, National Institute of
Health Sciences, 1-1-43, Hoenzaka, Chuo-ku, Osaka 540-0006,
Japan
In the Japanese Food Sanitation Law, the water
content or loss on drying (LOD) value of standard
materials for pesticide residue analysis is not
officially designated. In the present study, to investigate
the actual situation of the water content or LOD value
of commercial pesticide standards, 40 pesticide
standards were determined by the Karl-Fisher aquametry
(KF) and 24 pesticide standards were done by a thermogravimetric analysis (TGA). Furthermore, the
applicability of KF and TGA was also discussed. The
water content or LOD values of most pesticides were
within 1%, therefore they are regarded as having the
negligible values within the limit of error for the
residual pesticide analysis. However, since some
pesticides, dichloropropionic acid sodium salt, sodium
dimethyl dithiocarbamate, paraquat, diquat dibromide, formamidine hydrochloride, maneb,
iminoctadine triacetate, mancozeb and monocrotophos, had relatively large amounts of
water or LOD values, the water content and LOD value
of such pesticides should be carefully considered
during the pesticide residue analysis. For
comparison of KF and TGA, there are differences in both the
data for some pesticide standards. The reason seems
that the pesticides interfere with the KF redox
reaction.
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