Extractants and Extraction Conditions for Available Hg in Soil of a Rice--Vegetable Rotation System

JING Yan-de; HE Zhen-li; YANG Xiao-e

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Extractants and Extraction Conditions for Available Hg in Soil of a Rice--Vegetable Rotation System

- Extractants and Extraction Conditions for Available Hg in Soil of a Rice--Vegetable Rotation System
- Bulletin of Soiland Water Conservation Vol. 31, Issue 4, Pages: 185-189(2012)
- 作者机构：
  
  1. 山东省高校南四湖湿地生态与环境保护重点实验室,山东,济宁,273165
  2. 曲阜师范大学,山东,济宁,273165
  3. 浙江大学环境与资源科学学院教育部环境修复与生态健康重点实验室,浙江,杭州,210009
  4. 佛罗里达大学食品与农业科学研究所印度河研究与教育中心,美国佛罗里达皮尔斯堡,34945
- 作者简介：
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- Published：2012
- 稿件说明：
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JING Yan-de, HE Zhen-li, YANG Xiao-e. Extractants and Extraction Conditions for Available Hg in Soil of a Rice--Vegetable Rotation System[J]. Bulletin of Soiland Water Conservation, 2012, 31(4): 185-189.
DOI：

JING Yan-de, HE Zhen-li, YANG Xiao-e. Extractants and Extraction Conditions for Available Hg in Soil of a Rice--Vegetable Rotation System[J]. Bulletin of Soiland Water Conservation, 2012, 31(4): 185-189. DOI：

摘要

选择长三角地区代表性人为耕作土——青紫泥为研究对象，通过网室盆栽和室内试验，选用CaCl

，HCl，DTPA(二乙烯三胺五乙酸)和NH

OAc共4种提取剂，研究了水稻—小白菜—萝卜作物轮作系统中土壤有效态汞提取剂的选择与提取条件的优化问题．结果表明，不同提取剂提取的有效态汞含量随提取时间的延长而逐渐增加，30min可作为提取剂提取土壤有效态汞的最佳平衡时间；随土水比的减小，提取剂提取的土壤有效态汞量明显提高，1∶5为较适宜的土水比；不同提取剂的提取能力不同，对供试土壤，提取剂提取能力的大小顺序为：CaCl

＞HCl＞NH

OA＞DTPA．提取剂提取的土壤有效态汞量之间存在显著正相关，其中CaCl

和NH

OAc之间相关性最高；在土壤—水稻系统和土壤—萝卜系统中作物可食部位汞含量与提取剂提取的土壤有效态汞含量之间存在显著正相关关系，但在土壤—小白菜系统中相关性不强．综合分析，确定CaCl

为供试土壤汞有效态的最佳化学提取剂．

Abstract

The soil locally referred to as a purplish clayey soil(PCS)

which was sampled in Deqing County

Zhejiang Province. Both laboratory and greenhouse pot experiments were conducted to investigate availability of soil Hg to crop plants in a rice-cabbage-radish rotation system. Four extractants including 0.1 M hy-drochloric acid(HC1)

1 M ammonium acetate(NH4OAc

pH=7.0)

0. 005 M Diethylenetriaminepentaacetic acid(DTPA)

and 0.1 M calcium chloride(CaC12

pH=5.0) were compared for their adequacy in estimating mercury(Hg) availability to crop plants. The results show that the amounts of Hg extracted by each of the four procedures increased with extraction time. The optimal time required for extraction of soil Hg was ap-proximately 30 min the time

however

varied slightly among the four extractants. The amounts of extrac-ted Hg increased with decreasing soil/solution ratio

and a soil/solution ratio of 1~5 appeared to be adequate for soil Hg availability tests. The amounts of extracted Hg decreased in the order of used extraetants as CaC12＞HCl＞NH4OAc＞DTPA. Extractable soil Hg determined using the four extractants were correlated with each other positively significantly

especially between CaC12 and NH4OAc. Significant correlations were also found between extractable Hg in the soil and total Hg concentrations in edible tissues of rice and radish

except for cabbage. Overall

the 0.1 M CaC12 extraction provided the best estimation of available Hg in the soil and could be used to estimate phytoavailability of Hg in the rice-cabbage-radish rotation system.

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