Pesticide Residue Analysis and Chronic Dietary Exposure Assessment of Highland Barley from Different Regions
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Abstract:
In this study, highland barley samples from Qinghai and Tibet regions were examined, and 13 pesticides were quantified to determine the levels of pesticide residues in the samples. The risks of chronic dietary exposure to pesticide residues in highland barley from the two places were evaluated by comparison to the relevant standards. The results showed that the pesticide residue detection rate in Qinghai samples equaled 13.4%. Six pesticides were detected, namely carbendazim, difenoconazole, thiophanate-methyl, chlorpyrifos, triallate, and trifluralin, with the corresponding detection rates of 8.94%, 1.63%, 1.63%, 0.81%, 2.44%, and 0.81%. Two or more pesticide residues were found in 2.41% of the samples. The pesticide residue detection rate in the samples from Tibet was 8.55%. Four types of pesticides were detected: carbendazim, difenoconazole, thiophanate-methyl, and trifluralin, with detection rates of 3.42%, 3.42%, 0.85%, and 1.71%, respectively. Two pesticide residues were found in 0.86% of the samples. The chronic dietary exposure risk values for different age groups in China and of all pesticides detected in the highland barley samples from the two areas follow the order: (2~7 years) > (8~12 years) > (13~19 years) ≥ (> 65 years) ≥ (20~50 years) ≥ (51~65 years). The risk values for most female groups are higher than those of the corresponding male groups. The %ADI values range from 0.0004% to 0.14%, indicating that the contribution of pesticide residues from highland barley to the chronic dietary exposure risk is extremely low. The pesticide residue types, residual levels, and risk values of the highland barley samples from the two regions are different but the levels of pesticide residues in the highland barley samples from both regions are within the safety limit.
