灌溉条件下铬在黄土层中迁移机制的研究  

Study on migration mechanism of chromium in loess soil under irrigation condition

作　　者：王珑[1] 马耀光[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《干旱地区农业研究》2013年第1期122-126,共5页Agricultural Research in the Arid Areas

基　　金：国家自然科学基金(50879071)

摘　　要：通过室内土柱淋滤试验,以灌水量和铬浓度为控制因子,研究铬在黄土层中垂向迁移规律及吸附特性,以便解决铬污染导致的土壤及地下水环境质量问题。试验共设5个灌水定额和5个铬浓度,采用完全组合设计,共25个处理。试验结果显示:(1)相同铬浓度条件下,铬含量与灌水量和土层含水量呈正相关;10 cm土层深度处,当铬浓度为25.0 mg.L-1、灌水量为318.5 mm时,铬含量出现峰值98.7 mg.kg-1。(2)相同灌水量条件下,铬含量和吸附率都随铬浓度的增大而增大。表明铬在黄土中的迁移与土层深度、灌水量、土层含水量和铬浓度等因素密切相关。Aimed at the environmental quality issues of soil and groundwater caused by chromitun pollution, the vertical migration and absorption characteristics of chromium in loess were studied through indoor soil column-leaching test with the irrigation quantity and concentration of chromium as controlling factors. The experiments were performed with 25 treatments including 5 levels of irrigation quota and 5 levels of chromium concentration, using the full combination de- sign. The result showed that the soil chromium content in the same loess layer was positively correlated with irrigation quantity and soil water content under the condition of the same chromium concentration. When chromium concentration was 25.0 mg＂ L-1 and irrigation quantity was 318.5 mm, the content of chromium reached the highest point （98.7 rag＂ kg-1） at 10 cm soil depth. Under the condition of the same irrigation quantity, the chromium content and absorption rate in soil increased with the increase of chromium concentration. It could be concluded that the migration of chromium in loess was closely related with the depth of soil, irrigation quantity, soil water content and chromium concentration.

关 键 词：铬 黄土 迁移规律 

分 类 号：X53[环境科学与工程—环境工程] X52