Levels of lead, cadmium, mercury, copper and zinc elements in feedstuffs were measured by inductively coupled plasma-optical emission spectrometry. A total of 216 feedstuffs samples including corn silage, alfalfa hay, wheat straw, full ration pellet, wheat bran and barley were collected from polluted and unpolluted regions during four seasons and prepared with wet digestion. Lead and mercury concentrations did not differ significantly in various feedstuffs, but cadmium level was significantly the highest in barley samples (p < 0.05). All feed material samples had lead, cadmium and mercury concentrations well below the maximum levels allowed by the European Union. The lowest and highest levels of both copper and zinc were found in wheat straw and wheat bran, respectively, but their maximum content did not exceed the legal limits. In contrast to the sampling area, season significantly (P < 0.05) affected heavy metal levels, except for zinc, in feedstuffs.

中文翻译：

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来自伊朗南部的奶牛饲料中的重金属含量。

饲料中铅，镉，汞，铜和锌的含量通过电感耦合等离子体发射光谱法测定。在四个季节中，从污染和未污染的地区共收集了216份饲料样品，包括玉米青贮饲料，苜蓿干草，小麦秸秆，全定量颗粒，麦麸和大麦，并进行湿消化。各种饲料中铅和汞的浓度没有显着差异，但是大麦样品中的镉含量最高（p <0.05）。所有饲料原料样品中的铅，镉和汞浓度均远低于欧盟允许的最大浓度。小麦秸秆和麦麸中的铜和锌含量最低和最高，但其最大含量未超过法定限值。