商品奶与原料奶中农药与亚硝酸钠残留分析

摘要

The gas chromatograph (GC) method was used for analysis of pesticide residues and sodium nitrite residues in commercial milk and raw milk, and also analysis the effect of feeding pattern on pesticide residues in raw milk. The results showed that: Among five pesticides,Methamidophos, Dichlorvos and Malathion had high detection rate of pesticide residue, 45.0％～67.5％ with commercial milk, and 46.8％～71.2％ with raw milk. The detection rate and the residual quantity of Methamidophos, Dichlorvos, Trichlorfon, Malathion and Fenthion were no significant difference between commercial milk and raw milk (P ＞ 0.05); but the detection rate and the residual quantity of sodium nitrite had significant difference between commercial milk and raw milk (P ＜ 0.01). weighted average of detection rate, weighted average residual quantity and weighted total residual quantity of five pesticides were all large-scale farmers significantly lower than backyard farmers and cooperative breeding farmers (P ＜ 0.05), and the were no significant difference between the later two feeding pattern (P ＞ 0.05).%采用高效气相色谱(GC)分析法对商品奶和原料奶中农药和亚硝酸钠残留进行分析,并分析不同饲养模式对原料奶中农药残留的影响.结果表明:在所测定的5种农药中,甲胺磷、敌敌畏和马拉硫磷等3种农药残留检出率较高,商品奶为45.0%～67.5%,原料奶为46.8%～71.2%.商品奶和原料奶中甲胺磷、敌敌畏、敌百虫、马拉硫磷和倍硫磷检出率和残留量差异不显著(P＞0.05);而商品奶和原料奶中亚硝酸钠检出率和残留量差异极显著(P＜0.01).原料奶中5种农药加权平均检出率、农药加权平均残留量和加权残留总量均为规模化饲养显著低于农户散养和合作社饲养(P＜0.05),后两者之间无显著差异(P＞0.05).