Soil Water Science Department, University of Florida, Gainesville, FL 32611, United States.
Soil Water Science Department, University of Florida, Gainesville, FL 32611, United States; State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu 201146, China.
Sci Total Environ. 2014 Apr 1;476-477:440-6. doi: 10.1016/j.scitotenv.2014.01.018. Epub 2014 Jan 31.
Arsenic exposure from wood treated with chromated copper arsenate (CCA) remains a concern due to its presence around homes. This study evaluated children's exposure to As from CCA-treated staircases through determination of bioaccessible soil As and measurements of dislodgeable As on hand railings, steps and surfaces of household objects impacted by CCA-wood leachate. Total As concentrations in 84 soil samples from 4 apartment complexes were elevated at 1.2-66.6 mg/kg with bioaccessible As at 17-84%. Deterministic risk equations were used to estimate daily doses of As in children with estimates ranging from 0.41-54.9 μg/day from ingestion of dislodgeable As. Lifetime average daily doses from ingestion of dislodgeable As and soil ranged from 8.1×10(-6) to 3.0×10(-5) mg/kg/day, with estimated cancer risks being 1.2-4.5×10(-5). Collectively, these results highlight potential health risks in children who have near-daily exposure to As from CCA-wood and are consistent with estimates generated by USEPA's SHEDS-Wood probabilistic exposure model.
由于木材处理过程中使用了砷酸铜铬 (CCA)，暴露于其中的砷仍令人担忧，因为这些木材存在于住宅周围。本研究通过测定生物可利用土壤砷以及测量受 CCA 木材浸出物影响的扶手、台阶和家用物品表面的可脱落砷，评估了儿童因接触 CCA 处理过的楼梯而接触砷的情况。4 个公寓大楼的 84 个土壤样本中的总砷浓度为 1.2-66.6mg/kg，生物可利用砷浓度为 17-84%。使用确定性风险方程估计儿童从可脱落砷摄入的砷每日剂量，估计范围为 0.41-54.9μg/天。从摄入可脱落砷和土壤中摄入的终生平均每日剂量范围为 8.1×10(-6)至 3.0×10(-5)mg/kg/天，估计癌症风险为 1.2-4.5×10(-5)。总的来说，这些结果突出了那些每天都因接触 CCA 木材而面临砷暴露的儿童的潜在健康风险，与美国环保署的 SHEDS-Wood 概率暴露模型生成的估计值一致。
