[Investigation of heavy metal contamination in four kinds of fishes from the different farmer markets in Beijing].

To understand the contamination level and the exposure risk of heavy metals in aquatic products in Beijing, an inductively coupled plasma mass spectrometry (ICP-MS) was applied to determine nine heavy metals including Pb, Cd, Cr, As and so on in crucian carp, carp, grass carp and chub from the different farmer markets in Beijing city. All of 96 samples were collected in this study. In them, the concentration of Pb, Cd, Cr, Cu, Ni, Mn, Zn, Fe, As are < 0.2 microg x kg(-1) -2.856 mg x kg(-1), < 0.2 microg x kg(-1) 1.965 mg x kg(-1), 0.207-1.965 mg x kg(-1), 0.025-10.506 mg x kg(-1), < 0.2 microg x kg(-1) -1.971 mg x kg(-1), 0.020-3.034 mg x kg(-1), 0.630-33.260 mg x kg(-1), 9.308-26.308 mg x kg(-1), < 0.2 microg x kg(-1) -5.266 mg x kg(-1) respectively. The fishes living at the bottom of the water body were with higher heavy metal level than those living at the middle and the top of the water body. The heavy metal concentration correlation with fish species may be due to the food chain and the age of the fishes. In 96 samples, 80 percent of them meet the requirement of China national standard with 14.6%, 5.2% and 10.4% of Pb, Cd and As excess limit values. Considering different consumer's habits and the toxicology difference for different form of heavy metal, further research is needed to assess the risk of heavy metal intake for resident in Beijing.