Bhargava O P, Bumsted H E, Grunder F I, Hunt B L, Manning G E, Riemann R A, Samuels J K, Tatone V, Waldschmidt S J, Hernandez P
Am Ind Hyg Assoc J. 1983 Jun;44(6):433-6. doi: 10.1080/15298668391405094.
The diphenylcarbazide colorimetric method was evaluated by analyzing spiked PVC filters prepared by an AIHA-accredited consultant laboratory for chromium (VI). All seven participating laboratories received the samples and performed the analyses at the same time. Three laboratories simultaneously tested three alternative analytical procedures. Reduced amounts of chromium (VI) were found by both the consultant and participating laboratories when using the test procedure and one of the alternative methods. Two of the alternative analytical methods, both of which involve an alkaline extraction procedure, provided higher recoveries and more precise values for the test filters. It appears that the alkaline extraction procedure may be more appropriate for occupational health samples taken in steel industry environments which may include several interferents. Suggestions are made for further studies to determine the most appropriate analytical method.
通过分析由一家经美国工业卫生协会认可的咨询实验室制备的加标聚氯乙烯过滤器中的六价铬，对二苯卡巴肼比色法进行了评估。所有七个参与实验室都收到了样品，并同时进行分析。三个实验室同时测试了三种替代分析程序。当使用测试程序和其中一种替代方法时，咨询实验室和参与实验室均发现六价铬含量有所降低。两种替代分析方法，均涉及碱性萃取程序，为测试过滤器提供了更高的回收率和更精确的值。看来碱性萃取程序可能更适合于在钢铁行业环境中采集的职业健康样品，这些样品可能包含多种干扰物。建议进行进一步研究以确定最合适的分析方法。
