二硫化碳接触工人尿2-硫代噻唑烷-4-羧酸排泄规律的研究

目的　探讨二硫化碳 (CS2 )接触工人尿 2 硫代噻唑烷 4 羧酸 (TTCA)的排泄规律 ,为制定CS2 短时接触生物监测提供实验依据。方法　将受试对象分为 3组进行实验 :(1) 14名非CS2 接触者在某CS2 车间暴露 2h后收集不同时段尿液 ,分析其TTCA浓度变化 ;(2 )某CS2 车间 15名CS2 接触工人三班倒休息 4 8h后上班 ,连续收集 3d班前、班中、班末尿 ,分析其TTCA浓度变化 ;(3)收集 4 0名长期接触CS2 工人班末尿 ,分析其TTCA浓度变化与工人接触CS2 的 8h时间加权平均浓度 (PC TWA)的关系。结果　第 1组研究结果显示 ,接触CS2 4h后 (此时已停止接触 2h)尿中TTCA含量达到最高值 (1.0 3± 0 .72 )mg/gCr];第 2组研究结果显示 ,班前尿TTCA含量极低 (0 .37± 0 .2 8)mg/gCr],与班中尿 上班后 4h(1.2 3± 0 .71)mg/gCr]及班末尿 (1.31± 0 .78)mg/gCr]比较 ,差异有显著性 (P <0 .0 1) ,而班中尿TTCA值与班末尿相比 ,差异无显著性 (P >0 .0 5 ) ;第 3组研究结果显示 ,班末尿TTCA值与工人PC TWA之间有直线关系 Y(TTCAmg/gCr) =1.16 36X(CS2 mg/m3) - 5 .4 116 ]。结论　班末尿TTCA值可作为CS2 接触工人的生物监测指标。

Urinary excretion pattern of 2-thio-thiazolidine-4-carboxylic acid in workers exposed to Carbon disulfide

OBJECTIVE: To study the urinary excretion pattern for of 2-thio-thiazolidine-4-carboxylic acid (TTCA) in workers exposed to CS2, so as to provide experimental basis for working out biomonitoring measures for short-term exposure to CS2. METHODS: Sixty-nine subjects were divided into three groups: (1) fourteen volunteers who had not been exposed to CS2 before were exposed to CS2 for 2 hours, their urine samples were collected and analyzed at different time points; (2) The urine samples of 15 occupational exposure workers were collected on pre-shift, mid-shift, post-shift; (3) The relationship between 8 h time weighted average CS2 exposure concentrations (PC-TWA) and TTCA levels of post-shift urine was studied among 40 workers chronically exposed to CS2. RESULTS: (1) In the 1st group, urine TTCA level reached the peak (1.03 +/- 0.72) mg/gCr] 4 h after exposure; (2) In the 2nd group, urine TTCA level on pre-shift (0.37 +/- 0.28) mg/gCr] was lower than that on mid-shift (1.23 +/- 0.71) mg/gCr, P<0.01] and post-shift (1.31 +/- 0.78) mg/gCr, P<0.01]; (3) In the 3rd group, there was a linear relationship between the post-shift urine TTCA level and 8 h CS2 exposure concentrations dose (PC-TWA). The regression equation is Y(TTCA mg/gCr)=1.163 6X(CS2 mg/m3)-5.411 6. CONCLUSION: The post-shift urine TTCA levels may be regarded as a bio-monitoring index for workers exposed to CS2.