土壤有效态重金属提取剂选择的研究

On Relation Between Heavy Metal Available Contents of Soil Determined by Different Extractants and of Maize Organs

利用5种不同的土壤重金属浸提剂,研究了土壤有效态重金属含量与玉米重金属含量的关系,并提出了一种新的土壤有效态重金属的浸提剂。结果表明:0.1mol/L HCl,0.05mol/L EDTA-2Na,0.1mol/L CaCl2,0.1mol/L HAc-NaAc,0.05mol/L DTPA提取的化学有效态重金属与玉米根、茎、叶中重金属Cu、Zn、Cd、Pb大部分呈显著或极显著相关,但各化学提取剂提取的有效态Zn、Cu与玉米籽粒Zn、Cu的相关性较差。利用柠檬酸-酒石酸为提取剂提取的重金属含量与玉米籽粒中重金属的含量有着相对较好的相关性,是一种预估玉米籽粒中重金属含量的较好办法。

The relation between heavy metal contents of soil and of maize organs in Huludao city was studied. The available heavy metals in soil were extracted by five different extractants, i.e. 0.1 mol/L HCI, 0.05 mol/L EDTA-2Na, 0.1 mol/L CaCI2, 0.1 mol/L HAe-NaAe and 0.05 mol/L DTPA, and a new extractant was reported. The results showed that there were significant correlations between the available heavy metal contents of soil extracted by different extractants and of the roots, stems and leaves of maize, but the correlations between Zn and Cu contents of soil and of the seeds of mazie were insignificant. However, significant correlation was found between the heavy metal contents of soil extracted by citric-tartkc and of the seeds of maize. This extracting method could be helpful to estimate the heavy metal contents in the seeds of maize.