[Residues of total mercury and methyl mercury in eel products].

Fifty-two samples of broiled eels and broiled eel liver were analyzed for total mercury (total Hg) and methyl mercury. The mean concentrations of total Hg in broiled eels and broiled eel liver were 0.21 ppm and 0.

[Analysis of moxidectin by LC/MS and determination of residues in adipose and muscle tissues in commercial beef].

We have analyzed moxidectin residues in beef by a rapid and highly sensitive liquid chromatography-mass spectrometry (LC/MS) method without fluorescent derivatization. By using atmospheric pressure chemical ionization (APCI) with a fragment voltage of 100 V, good measurement results were obtained and the recoveries of moxidectin were 93.3% and 96.