Study On The Measurement Uncertainty In Chemical Soil Analysis

This thesis based on standard uncertainity documents, which were "Guide to the Expression of Uncertainty in Measurement"(GUM 1995) and "Evaluation and Expression of Uncertainty in Measurement"(JJF 1059-1999).The main contents and conclusions as follows:(1) huangni soil as the object of study, according to ISO-14256-2 analytical method. The soil sample measured the mass fraction of nitrate:11.8±1.2 mg/kg (k=2). Uncertainty of measurement the major influencing factors showed that(as related uncertainty):Soil sample extraction pre-treatment is produced the greatest uncertainty.(2) GSS-1 (GSW 07401) as the object of study, according to GB/T 17139-1997 analytical method. The soil sample measured the mass fraction of nickel:20.8±1.6mg/kg (k=2). Uncertainty of measurement the major influencing factors showed that(as related uncertainty): Soil sample extraction pre-treatment is produced the greatest uncertainty.(3) A measurement uncertainty calculation software had been written useing Visual Basic language, hich was based on the requirements of evaluation of measurement uncertainty.