Vertical characteristics and content grade of chemical elements in the ground substrate (0-50 m deep) of Baiquan area, Songnen Plain
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摘要:
对黑龙江省拜泉县BQZK05汽车钻取得的50 m以浅土质基质样品进行了分析, 获得全芯土质主量元素、矿质元素、有益元素和有毒元素垂向分布特征, 并对全芯土质部分化学元素进行了质量评价.结果显示, 主量元素CaO含量属于三等中等级, MgO含量属于二等较丰富级, Fe2O3含量属于二等较丰富级; 矿质元素Fe含量属于四等较缺乏级, Mn含量属于三等中等级, S含量属于一等丰富级; 有益元素Se含量属于适量级, I含量属于缺乏级, F含量属于高含量级, K含量为中上等(3级); 有毒元素含量远低于农用地土壤污染风险筛选值和管制值, 土壤环境质量为一等清洁级.
Abstract:By analyzing the soil substrate samples in the depth of 0-50 m from borehole BQZK05 in Baiquan County, Heilongjiang Province, the study ascertains the vertical distribution characteristics of major, mineral, beneficial and toxic elements, and evaluates the quality of some chemical elements in the soil. The results show that the CaO content belongs to Grade Ⅲ(medium), MgO content Grade Ⅱ(rich), and Fe2O3 content Grade Ⅱ(rich) in terms of major elements. Of the mineral elements, Fe content belongs to Grade Ⅳ (deficient), Mn content Grade Ⅲ(medium), and S content Grade Ⅰ(abundent). In terms of beneficial elements, the Se content belongs to moderate grade, I content the deficient grade, F content the high grade, and K content the middle-high grade. The content of toxic elements is much lower than the risk screening value and control value of agricultural land soil pollution, and the soil environment quality is first-class clean.
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Key words:
- black soil /
- ground substrate /
- element content grade /
- Songnen Plain
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表 5 土壤环境质量标准值
Table 5. Standard values of soil environment quality
级别 一级 二级 三级 土壤pH值 自然背景 6.5~7.5 ＞7.5 镉 ≤0.2 0.2~1 ＞1 汞 ≤0.15 0.15~1.5 ＞1.5 砷 水田 ≤15 15~30 ＞30 旱地 ≤15 15~40 ＞40 铜 农田等 ≤35 35~400 ＞400 果园 - 150~400 ＞400 铅 ≤35 35~500 ＞500 铬 水田 ≤90 90~400 ＞400 旱地 ≤90 90~300 ＞300 锌 ≤100 100~500 ＞500 镍 ≤40 40~200 ＞200 六六六 ≤0.05 0.05~1 ＞1 滴滴涕 0.05 0.05~1 1 含量单位: 10-6. 
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表 6 土壤环境地球化学等级划分
Table 6. Geochemical grading of soil environment
质量等级 一等（清洁） 二等（轻微污染） 三等（轻度污染） 四等（中度污染） 五等（重度污染） 环境指数 Pi≤1 1＜Pi≤2 2＜Pi≤3 3＜Pi≤5 Pi; 5
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