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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Temperature Effect on Water Extractability of Cadmium Copper Lead and Zinc from Composted Organic Solid Wastes of South-West Nigeria
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Temperature Effect on Water Extractability of Cadmium Copper Lead and Zinc from Composted Organic Solid Wastes of South-West Nigeria

机译：温度对尼日利亚西南部堆肥有机固体废物中镉铜铅和锌的可萃取性的影响

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摘要

The effect of temperature changes (10 to 80 °C) on water-extractable metal (Zn, Cu, Cd and Pb) concentrations of composted wastes of Nigerian origin was investigated in batch extraction experiments. Metal concentrations were measured using a calibrated atomic absorption spectrophometer after acid digestions. Results showed that the water-extractable metal fractions (>I) did not exceed 10% of total metal concentrations of the bulk composts, which corresponded to 0.30 to 6.63% for Zn, 0.09 to 7.51% for Pb, 1.83 to 9.29% for Cu and 0.67 to 9.23% for Cd. Water extractable metal fraction showed positive correlations (r = 0.137 to 0.917*; p* < 0.01) for Cu, Cd and Pb in most cases but negative for Zn (−0.067 to −0.445). Simulations revealed that a steady temperature rise from 0.1 to 1.5 °C might increase >I by 0.13 to 168% for all the metals, although stability to gradual temperature rise was demonstrated in some instances. The study revealed that the degree of temperature effect on water extractability of heavy metals from the bulk composts was dependent on metal type, compost formulation and waste type.
机译：在批次提取实验中，研究了温度变化（10至80°C）对尼日利亚来源的堆肥废物的水可提取金属（Zn，Cu，Cd和Pb）浓度的影响。酸消解后，使用校准的原子吸收光谱仪测量金属浓度。结果表明，水可提取金属部分（> I ）不超过堆肥中总金属浓度的10％，相当于Zn的0.30％至6.63％，Pb的0.09％至7.51％，铜为1.83至9.29％，镉为0.67至9.23％。在大多数情况下，Cu，Cd和Pb的水可萃取金属分数显示出正相关（r = 0.137至0.917 *； p * <0.01），而Zn则呈负相关（-0.067至-0.445）。模拟表明，从0.1到1.5°C的稳定温度升高可能使所有金属的> I 增加0.13至168％，尽管在某些情况下证明了对逐渐升高的温度的稳定性。研究表明，温度对散装堆肥中重金属的水提取能力的影响程度取决于金属类型，堆肥配方和废物类型。

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