Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, 19 Le Thanh Tong, Hanoi, 11000, Vietnam.
Institute of Theoretical and Applied Research, Duy Tan University, Hanoi, 100000, Vietnam.
Environ Geochem Health. 2023 May;45(5):1711-1722. doi: 10.1007/s10653-022-01298-6. Epub 2022 May 27.
Comprehensive studies on emerging contaminants like volatile methyl siloxanes in settled dust from different micro-environments are still limited. In this study, concentrations and distribution of cyclic volatile methyl siloxanes (CVMSs) including D3, D4, D5, and D6 were examined in indoor dust samples collected from various micro-environments in northern and central Vietnam. Concentrations of total CVMSs in the dust samples ranged from 86.0 to 5890 (median 755) ng/g and decreased in the order: waste processing workshops (median 1560; range 329-5890) > common houses (650; 115-1680) > university classrooms (480; 86.0-1540) > vehicle repair shops (295; 126-1950) ng/g. This observation suggests that informal waste processing activities are sources of CVMSs. Among the studied CVMSs, D5 was the most predominant compound (41 ± 14%), followed by D6 (26 ± 13%), D4 (23 ± 12%), and D3 (11 ± 11%). Moderate positive correlations between D3/D4, D4/D5, and D5/D6 were found. Median daily intake doses of D3, D4, D5, and D6 through dust ingestion were 0.016, 0.051, 0.11, and 0.054 ng/kg/d, respectively, which were comparable to water consumption and markedly lower than the air inhalation pathway.
综合研究新兴污染物如挥发性甲基硅氧烷在不同微环境的沉降灰尘仍然有限。在这项研究中，浓度和分布的环状挥发性甲基硅氧烷（CVMSs）包括 D3，D4，D5，和 D6 在室内灰尘样本中采集不同的微环境在越南北部和中部。总 CVMSs 在灰尘样本中的浓度范围从 86.0 到 5890（中位数 755）ng/g 并减少的顺序：废物处理车间（中位数 1560；范围 329-5890）>普通房屋（650；115-1680）>大学教室（480；86.0-1540）>汽车修理店（295；126-1950）ng/g。这一观察表明，非正式的废物处理活动是 CVMSs 的来源。在研究的 CVMSs 中，D5 是最主要的化合物（41±14%），其次是 D6（26±13%），D4（23±12%），和 D3（11±11%）。D3/D4、D4/D5 和 D5/D6 之间存在中度正相关。通过灰尘摄入的 D3、D4、D5 和 D6 的日均摄入量分别为 0.016、0.051、0.11 和 0.054ng/kg/d，与水摄入量相当，明显低于空气吸入途径。
