用于评估中国代表性土壤中铬（Cr）对水稻（Oryza sativa L.）植物可利用性的模型。

Model for evaluation of the phytoavailability of chromium (Cr) to rice (Oryza sativa L.) in representative Chinese soils.

机构信息

Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University , Hangzhou 310058, China.

出版信息

J Agric Food Chem. 2013 Mar 27;61(12):2925-32. doi: 10.1021/jf400467s. Epub 2013 Mar 18.

DOI:10.1021/jf400467s

PMID:23469834

Abstract

Anthropogenic chromium (Cr) pollution in soils poses a great threat to human health through the food chain. It is imperative to understand Cr phytoavailability to rice (Oryza sativa L.), which is a major staple food crop for the largest population of people on Earth. This study was aimed to establish a model for evaluation of the phytoavailability of Cr to rice in six representative Chinese soils based on soil properties. Simple correlation analysis indicated that Cr concentration in polished rice was significantly correlated with total Cr, Mehlich-3 extractable Cr, and Cr(VI) in soil. Stepwise multiple regression analysis also demonstrated that the Cr phytoavailability was strongly correlated with soil total Cr, Mehlich-3 extractable Cr, Cr(VI) concentration, soil organic matter, Fe(II), and particle size distribution. Critical Cr concentrations in the six soils were evaluated for rice based on the maximum safe level for daily intake of Cr. Mehlich-3 extractable Cr are the most suitable Cr thresholds for Periudic Argosols, Udic Ferrisols, Mollisols, and Ustic Cambosols with values of 1.54, 0.56, 0.42, and 2.18 mg kg(-1), respectively, while Cr(VI) are adequate thresholds for Calcaric Regosols and Stagnic Anthrosols with values of 0.68 and 0.84 mg kg(-1), respectively.

摘要

人为因素导致的土壤铬（Cr）污染通过食物链对人类健康构成了巨大威胁。了解 Cr 对水稻（Oryza sativa L.）的植物可利用性至关重要，因为水稻是地球上人口最多的主要主食作物。本研究旨在基于土壤特性，建立一个评价中国 6 种代表性土壤中 Cr 对水稻植物可利用性的模型。简单相关分析表明，精米中 Cr 浓度与土壤总 Cr、 Mehlich-3 可提取 Cr 和 Cr(VI)呈显著正相关。逐步多元回归分析也表明，Cr 的植物可利用性与土壤总 Cr、 Mehlich-3 可提取 Cr、Cr(VI)浓度、土壤有机质、Fe(II)和粒径分布密切相关。根据 Cr 每日摄入量的最大安全水平，对 6 种土壤中的水稻进行了临界 Cr 浓度评价。Mehlich-3 可提取 Cr 是 Periudic Argosols、Udic Ferrisols、Mollisols 和 Ustic Cambosols 的最适 Cr 阈值，分别为 1.54、0.56、0.42 和 2.18 mg kg(-1)，而 Cr(VI)是 Calcaric Regosols 和 Stagnic Anthrosols 的适宜阈值，分别为 0.68 和 0.84 mg kg(-1)。