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比较了三种提取剂：１ｍｏｌ／ＬＮＨ＿４ＯＡｃ、０．００５ｍｏｌ／ＬＤＴＰＡ－ＴＥＡ，０．１ｍｏｌ／Ｌ，ＨＣ１，对南北方的水稻土和灰钙土中的有效态Ｃｄ、Ｃｕ、Ｚｎ、Ｐｂ的提取率、各种相关性以及临界提取量和误差等。结果表明：北方灰钙土中有效态Ｃｄ的适宜提取剂为ＮＨ＿４ＯＡｃ，其次为ＤＴＰＡ、ＨＣ１；有效态Ｃｕ、Ｚｎ的适宜提取剂皆为ＤＴＰＡ，而南方水稻土中有效Ｃｄ、Ｃｕ的适宜提取剂也均为ＤＴＰＡ。
The extraction efficiencies of Cd, Cu, Zn and Pb in paddy soils and calcareous soils from the north and south of China were compared among three extractants: 1 mol / L NH4OAc, 0.005 mol / L LDA-TEA, 0.1 mol / L HC1 Rate, various correlations and critical extraction and error. The results showed that the suitable extractants of available Cd in the northern calcareous soil were NH4OAc, followed by DTPA and HC1. The suitable extractants of available Cu and Zn were DTPA, while the suitable extractants of Cd and Cu in the southern paddy soil Also are DTPA.