土壤和茶叶中重金属富集的协同评估和健康风险评估对于保证消费者安全至关重要。然而,在人类活动叠加的高土壤HM地球化学背景区域,土壤-茶叶系统中与HM相关的健康风险尚不清楚。本研究评估了HM浓度(即,铬(Cr),镉(Cd),砷(As),和铅(Pb)中的茶叶及其与中国西南地区土壤含量的关系,以评估成年人的相关健康风险。结果表明,土壤中Cr的平均浓度最高(79.06mgkg-1),其次是铅(29.27mgkg-1),As(14.87mgkg-1),和Cd(0.18mgkg-1)。大约0.71、4.99、7.36和10.21%的土壤样品超过了铅的阈值(NY/T853-2004),Cr,As,还有Cd,分别。此外,铅的平均浓度,As,茶叶中的Cd低于相应的残留限值,但Cr高于允许的限值。相关分析表明,Cr,As,茶叶中的Cd含量与其土壤含量呈正相关(p<0.01),R2为0.203**,0.074**,0.036**,和0.090**,分别。此外,约40.38%的样本被发现受污染。此外,空间分布统计分析显示,澜沧江受到中度污染,而盈江,镇康,永德,镇远,吕春,京东,锡盟,孟连是轻微污染的地区。铅的目标危害商(THQ;健康风险评估),Cr,As,所有县的Cd和危害指数(HI)均低于1,这表明饮茶不太可能带来健康风险。
The collaborative assessment and health risk evaluation of heavy metals (HMs) enrichment in soils and tea leaves are crucial to guarantee consumer safety. However, in high soil HM geochemical background areas superimposed by human activities, the health risk associated with HMs in soil-tea systems is not clear. This study assessed the HMs concentration (i.e., chromium (Cr), cadmium (Cd), arsenic (As), and lead (Pb)) in tea leaves and their relationship with soil amounts in the southwest region of China to evaluate the associated health risk in adults. The results revealed that the average soil concentration of Cr was the highest (79.06 mg kg-1), followed by Pb (29.27 mg kg-1), As (14.87 mg kg-1), and Cd (0.18 mg kg-1). Approximately 0.71, 4.99, 7.36, and 10.21% of soil samples exceeded the threshold values (NY/T 853-2004) for Pb, Cr, As, and Cd, respectively. Furthermore, the average concentration of Pb, As, and Cd in tea leaves was below the corresponding residue limits, but Cr was above the allowed limits. Correlation analysis revealed that the Pb, Cr, As, and Cd amounts in tea leaves were positively correlated to their soil amounts (p < 0.01) with an R2 of 0.203 **, 0.074 **, 0.036 **, and 0.090 **, respectively. Additionally, approximately 40.38% of the samples were found to be contaminated. Furthermore, spatial distribution statistical analysis revealed that Lancang was moderately contaminated, while Yingjiang, Zhenkang, Yongde, Zhenyuan, Lüchun, Jingdong, Ximeng, and Menglian were slightly contaminated areas. The target hazard quotients (THQ; health risk assessment) of Pb, Cr, As, and Cd and the hazard index (HI) of all the counties were below unity, suggesting unlikely health risks from tea consumption.