ZHANGGuo-zhen,GAOGuang-hui,WANGGuang-zong,et al.Water Quality Assessment and Heavy Metal Health Risk Evaluation in Northwest Alpine Pastoral Area[J].China Water & Wastewater,2023,39(11):42-48.
Water Quality Assessment and Heavy Metal Health Risk Evaluation in Northwest Alpine Pastoral Area
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第11期
Page:
42-48
Column:
Date of publication:
2023-06-01
- Keywords:
- alpine pastoral area; principal component analysis method; water quality assessment; heavy metal; health risk evaluation
- Abstract:
- According to the water quality situation and its influence on human health in northwest alpine pastoral area, the water quality indicators of pastoral area were evaluated by using principal component analysis method. The health risk of heavy metal such Cd, As, Cu, Pb and Fe in water was evaluated by using the health risk assessment model. There was a strong correlation among ammonia nitrogen, organic matter, heat-resistant E. coli, total phosphorus and total nitrogen. Organic matter, ammonia nitrogen and heat-resistant E. coli were the main pollutants affecting water quality in pastoral area. The concentrations of Cd, As, Cu, Pb, and Fe all met Ⅲ level criteria specified in Environmental Quality Standards for Surface Water (GB 3838-2002). The health risk of carcinogenic heavy metals was much higher than that of non-carcinogenic heavy metals, and the risk levels varied by an average of 105-107 times. However, the health risk level of carcinogenic heavy metals did not exceed the maximum acceptable risk level of 5.0×10-5 a-1 recommended by the international commission on radiological protection (ICRP), which was an acceptable risk for human body. The results indicated that the heavy metals in water in pastoral area were less harmful to human health. The health risk of carcinogenic heavy metals in descending order was Cd and As, while that of non-carcinogenic heavy metals in descending order was Cu, Fe and Pb.
Last Update:
2023-06-01