金属含量和土壤颗粒质量对铬污染土壤健康风险的相对贡献。
Relative Contribution of Metal Content and Soil Particle Mass to Health Risk of Chromium-Contaminated Soil.
机构信息
Guangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Department of Geography, Florida State University, Tallahassee, FL 32306, USA.
出版信息
Int J Environ Res Public Health. 2022 Apr 26;19(9):5253. doi: 10.3390/ijerph19095253.
Three soil samples from a chromium (Cr)-contaminated field were classified into five particle fractions (i.e., 0-50 μm, 50-100 μm, 100-250 μm, 250-500 μm, and 500-1000 μm) and were further characterized to study their physicochemical properties and Cr bioaccessibility. The results indicated that the gastrointestinal bioaccessibility estimated by the Solubility Bioaccessibility Research Consortium (SBRC) method was on average 15.9% higher than that by the physiologically based extraction test (PBET) method. The health risk of all samples was within the safe range, and the health risk based on total Cr content may be overestimated by an average of 13.2 times compared to the bioaccessibility-based health risk. The health risk investigated from metal content was mainly contributed by the 50-250 μm fraction, which was 47.5, 50.2, and 43.5% for low-, medium-, and high-level polluted soils, respectively. As for the combined effect, the fractions of 100-250 μm and 500-1000 μm contributed the highest proportion to health risk, which was 57.1, 62.1, and 64.4% for low-level, medium-level, and high-level polluted soils, respectively. These results may further deepen the understanding of health risk assessment and quantify the contribution of the soil particle mass to health risk.
从一个铬（Cr）污染场地采集了三个土壤样本，将其分为五个颗粒级分（即 0-50μm、50-100μm、100-250μm、250-500μm 和 500-1000μm），并对其进行进一步表征，以研究其物理化学性质和 Cr 的生物可给性。结果表明，通过溶解性生物可给性研究协会（SBRC）方法估计的胃肠道生物可给性平均比基于生理的提取测试（PBET）方法高 15.9%。所有样本的健康风险均处于安全范围内，与基于生物可给性的健康风险相比，基于总 Cr 含量的健康风险可能平均高估了 13.2 倍。基于金属含量的健康风险主要来自 50-250μm 级分，对于低、中、高污染土壤，其健康风险分别占 47.5%、50.2%和 43.5%。对于综合效应，100-250μm 和 500-1000μm 级分对健康风险的贡献最高，对于低、中、高污染土壤，其健康风险分别占 57.1%、62.1%和 64.4%。这些结果可能进一步深化对健康风险评估的理解，并量化土壤颗粒质量对健康风险的贡献。
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