The toxicity of benzene is well known, and its leukemia effect has established. It is a natural constituent of crude oil and the diseases related to its exposure are recognized as occupational diseases. <strong>...The toxicity of benzene is well known, and its leukemia effect has established. It is a natural constituent of crude oil and the diseases related to its exposure are recognized as occupational diseases. <strong>Objective:</strong> To assess occupational exposure of benzene to workers in an oil and gas production company. <strong>Materials and Methods:</strong> Firstly, it was a descriptive, cross-sectional study which consisted of benzene atmospheric quantification in a sample individual measurement of a homogeneous exposure group of workers. Secondly, urinary assays of S-phenylmercapturic acid have been performed at the end of the shift in the selected workers.<strong> Results:</strong> The study has included 79 (47.88%) workers, 17 atmospheric samples were usable and 79 urinary assays at the end of the shift were performed. The average benzene concentration for all sites was 10 times lower than the regulatory average exposure value (1 ppm = 3.2 mg/m<sup>3</sup>): average: 0.122 pp, median: 0.053 ppm and range: 0.019 - 1.448 ppm. All 79 urinary assays of S-phenylmercapturic acid with a biological exposure index of less than 25 μg/g creatinine: mean: 0.70 μg/g creatinine, median: 0.52 μg/g creatinine and extends: 0.23 to 6.7 μg/g creatinine. <strong>Conclusion:</strong> Exposure was below to the limit value for benzene in both atmospheric metrology and biometrology. Therefore it is an occupational group with low exposure to benzene. Thus, the medical supervision will be adapted according to the potentially exposing tasks.展开更多
目的优化高效液相色谱-质谱测定尿中苯巯基尿酸(SPMA)方法中的萃取和定量方法。方法尿液采用体积分数50.0%的硫酸进行水解;水解液采用固相萃取柱进行净化,经C18色谱柱分离,串联质谱检测。以同位素标记的SPMA作为内标,以内标工作曲线法...目的优化高效液相色谱-质谱测定尿中苯巯基尿酸(SPMA)方法中的萃取和定量方法。方法尿液采用体积分数50.0%的硫酸进行水解;水解液采用固相萃取柱进行净化,经C18色谱柱分离,串联质谱检测。以同位素标记的SPMA作为内标,以内标工作曲线法定量。结果SPMA的线性范围为0.50~50.00μg/L,相关系数为0.9998;方法的检出限和定量限分别为0.05和0.17μg/L;加标回收率为97.0%~102.0%,批内相对标准偏差(RSD)为0.6%~1.0%,批间RSD为1.7%~6.5%。采用本方法检测,职业性苯接触组人群尿中SPMA质量浓度高于无职业接触组(中位数:2.81 vs 0.28μg/g肌酐,P<0.05)。结论与国家标准方法比较,本方法采用固相萃取和内标法定量,改进后的方法有利于消除基质效应,准确度和精密度好,适用于尿中SPMA的测定。展开更多
文摘The toxicity of benzene is well known, and its leukemia effect has established. It is a natural constituent of crude oil and the diseases related to its exposure are recognized as occupational diseases. <strong>Objective:</strong> To assess occupational exposure of benzene to workers in an oil and gas production company. <strong>Materials and Methods:</strong> Firstly, it was a descriptive, cross-sectional study which consisted of benzene atmospheric quantification in a sample individual measurement of a homogeneous exposure group of workers. Secondly, urinary assays of S-phenylmercapturic acid have been performed at the end of the shift in the selected workers.<strong> Results:</strong> The study has included 79 (47.88%) workers, 17 atmospheric samples were usable and 79 urinary assays at the end of the shift were performed. The average benzene concentration for all sites was 10 times lower than the regulatory average exposure value (1 ppm = 3.2 mg/m<sup>3</sup>): average: 0.122 pp, median: 0.053 ppm and range: 0.019 - 1.448 ppm. All 79 urinary assays of S-phenylmercapturic acid with a biological exposure index of less than 25 μg/g creatinine: mean: 0.70 μg/g creatinine, median: 0.52 μg/g creatinine and extends: 0.23 to 6.7 μg/g creatinine. <strong>Conclusion:</strong> Exposure was below to the limit value for benzene in both atmospheric metrology and biometrology. Therefore it is an occupational group with low exposure to benzene. Thus, the medical supervision will be adapted according to the potentially exposing tasks.
文摘目的优化高效液相色谱-质谱测定尿中苯巯基尿酸(SPMA)方法中的萃取和定量方法。方法尿液采用体积分数50.0%的硫酸进行水解;水解液采用固相萃取柱进行净化,经C18色谱柱分离,串联质谱检测。以同位素标记的SPMA作为内标,以内标工作曲线法定量。结果SPMA的线性范围为0.50~50.00μg/L,相关系数为0.9998;方法的检出限和定量限分别为0.05和0.17μg/L;加标回收率为97.0%~102.0%,批内相对标准偏差(RSD)为0.6%~1.0%,批间RSD为1.7%~6.5%。采用本方法检测,职业性苯接触组人群尿中SPMA质量浓度高于无职业接触组(中位数:2.81 vs 0.28μg/g肌酐,P<0.05)。结论与国家标准方法比较,本方法采用固相萃取和内标法定量,改进后的方法有利于消除基质效应,准确度和精密度好,适用于尿中SPMA的测定。
