CAJ | 학술논문

采用氯化亚锡为还原剂，对硫氰酸盐分光光度法测定锡精矿中钨结果进行不确定度研究。测量过程中的不确定度主要来自样品制备过程引起的不确定度，定容导致的不确定度，溶液中钨的测量结果和测量结果重复性引起的不确定度，转化系数0．7931引入的不确定度以及试剂空白产生的不确定度。对各不确定分量进行分析计算，合成各不确定度分量，并乘以扩展因子2得到扩展不确定度。对于钨含量为208．5ug／g的锡精矿，其扩展不确定度为20．97ug／g。
채용록화아석위환원제，대류청산염분광광도법측정석정광중오결과진행불학정도연구。측량과정중적불학정도주요래자양품제비과정인기적불학정도，정용도치적불학정도，용액중오적측량결과화측량결과중복성인기적불학정도，전화계수0．7931인입적불학정도이급시제공백산생적불학정도。대각불학정분량진행분석계산，합성각불학정도분량，병승이확전인자2득도확전불학정도。대우오함량위208．5ug／g적석정광，기확전불학정도위20．97ug／g。
The measurement uncertainty of the analytical results for tungsten in tin concentrates with tin（II） chloride dihydrate as reducing agent by thiocyanate spectophotometric method was evaluated and the mathematic model for uncertainty expression was established. The total uncertainty mainly came from the sub--uncertainties of samples preparing process, volume, measurement results, repetitive experiments, conversion constant 0. 7931, reagent blanks, etc. The uncertainty expression and mathematical models for calculating each parameter were proposed. And the extend uncertainty for the method was obtained from the combined uncertainty multiplied by extended factor of 2. When the average content of W in the samples was 208. 5 ug/g, the expanded uncertainty was 8. 0 ug/g.