[Study on the contamination level and intake of organotins of Chinese dietary].

Objective: To obtain the baseline data of organotins' pollution of Chinese meal in order to carry on primary danger analysis of the exposure.
Methods: The samples of the third Chinese total diet study were determined by gas-chromatography pulsed flame photometric detector to estimate dietary intake of organotins. The dietary intake of organotins was estimated according to the contamination level of organotins and food consumption.
Results: Only several kinds of organotin were founded in several foods and no organotins was found in fruit, sugar and alcoholic beverages. Dimethyltin (DMT) were detected in some samples from Southern 1 area, the content ranged from 1.5 microg/kg to 4.1 microg/kg. Butyltin compounds existed in seafoods from Southern 1 area, the contents of tributyltin (TBT), dibutyltin (DBT) and monobutyltin (MTB) being 0.9 microg/kg, 1.1 microg/kg, 1.4 microg/kg respectively. The lower limit and upper limit of exposure to tributyltin were from 0.003 microg x kg(-1) x d(-1) to 0.006 microg x kg(-1) x d(-1) and from 0.004 microg x kg(-1) x d(-1) to 0.019 microg x kg(-1) x d(-1) respectively. Comparing to ADI of tributyltin (WHO), the Chinese dietary intake of tributyltin only accounted for 2.5% and that of butyltin only accounted for 3.5%. To identify the contamination source of organotins in Southern 1 area, the individual samples of aquatic food from individual province were analyzed, revealing that Fujian province and Shanghai City were the main contributors of organotins pollution in this area. The belt fish and yellow croaker were typical pollution samples. Higher levels of DMT were detected in seafood samples from Shanghai.
Conclusion: The exposure level of Chinese dietary was relative low, however the sources of organotin pollution needs further investigation.