title: Spectrophotometric determination of silicon tetrahydride in the air of workplace.
abstract: A new, simple and sensitive method was developed for the determination of silicon tetrahydride in the air of workplace in this study. The alkaline resin-based spherical activated carbon was used to collect sample of silicon tetrahydride at workplace. Silicon tetrahydride was then desorbed from active carbon in 100°C hot water. After reacting with ammonium molybdate, oxalic acid and 1,2,4-trichlorobenzene alpha-naphthol amino sulfonic acid under acid condition, silicon tetrahydride was transformed into silicon molybdenum blue. The absorbance of silicon molybdenum blue was quantitatively measured at the wavelength of 680 nm. The results showed that the average sampling efficiency and desorption efficiency were 97.53% and 94.94%, respectively by this method. Detection limits were 0.054 μg/mL for the spectrophotometric method and 0.14 mg/m(3) for the determination of silicon tetrahydride in the air of workplace (sampling volume was 7.5 L). The conversion rate of silicon tetrahydride gradually decreased when storage time of samples was extended. The descent rate of sample was less than 10% when the sample was sealed for 7 days in the room temperature. It was concluded that this spectrophotometric method can be successfully used to determine silicon tetrahydride in the worksites.
authors: Hubei Center for Disease Control and Prevention, Wuhan, 430070, China.|Zhangjiagang City Center for Disease Control and Prevention, Zhangjiagang, 215600, China.
authors: Na-Li
authors: NL
authors: Gu
authors: Hubei Center for Disease Control and Prevention, Wuhan, 430070, China.
authors: Ting-Ming
authors: TM
authors: Shi
authors: Department of Occupational & Environmental Health and Key Lab of Environment and Health of Ministry of Education, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
authors: Zhi-Hong
authors: ZH
authors: Zhang
authors: Hubei Center for Disease Control and Prevention, Wuhan, 430070, China.
authors: Sheng-Wen
authors: SW
authors: Shao
authors: Department of Occupational & Environmental Health and Key Lab of Environment and Health of Ministry of Education, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
authors: Tao
authors: T
authors: Jing
authors: Department of Occupational & Environmental Health and Key Lab of Environment and Health of Ministry of Education, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China. wchen@mails.tjmu.edu.cn.
authors: Wei-Hong
authors: WH
authors: Chen
mesh_terms: D000395:Air Pollutants, Occupational / Q000032:analysis*; D006801:Humans; D057230:Limit of Detection; D015203:Reproducibility of Results; D012821:Silanes / Q000032:analysis*; D013053:Spectrophotometry / Q000379:methods*; D017132:Workplace
chemical_list: D000395:Air Pollutants, Occupational; D012821:Silanes; C005625:monosilane