proficiency testing programme of cement chemical aanlysis in 2013

1、ProficiencyTestingProgrammeofCementChemicalAanlysisin2013XiaolingZhu1RuihaiWang1ShashaWu11ChinaBuildingMaterialTest&CertificationGroupCo.Ltd.No.1GuanzhuangDongliChaoyangDistrictBeijing100024ChinaAbstractThispapersummariz

2、estheproficiencytestingprogrammeofcementchemicalanalysisperfmedbyChinaBuildingMaterialTest&CertificationGroupCo.Ltd.(CTC)in2013.TherearetenitemstoberequiredtotestaccdingtoGBT1762008stard.Thepaperputsouttwostatisticanalys

3、ismethodscombinedmakesstatisticanalysistoallresultssubmittedbyparticipants.Keywds:proficiencytestingprogrammecementchemicalanalysisstatisticanalysismethodscombineA0463.9063.972.472.49B0461.9761.922.712.75A0563.8963.872.4

4、92.51B0561.9261.842.742.71A0663.9463.862.452.47B0661.8861.852.732.75A0763.9963.902.502.49B0761.9461.972.702.76A0863.8463.872.512.46B0861.9061.892.742.74A0963.8963.922.482.45B0961.9861.922.742.79A1063.8863.962.472.50B1061

5、.8561.902.792.78F1.201.06F1.891.52CriticalvalueofFF0.05（9，10）=3.02ConclusionUndersignificancelevelof0.05thehomogeneityofCaOinsampleAisqualified.Undersignificancelevelof0.05thehomogeneityofSO3insampleAisqualified.Conclusi

6、onUndersignificancelevelof0.05thehomogeneityofCaOinsampleBisqualified.Undersignificancelevelof0.05thehomogeneityofSO3insampleBisqualified.2.4.3StabilitycheckCTChasdevelopedmanystardsubstanceinbuildingmaterialsfieldsince1

7、978.Accdingtoourlongexperiencetomanufacturestardsubstancethecompositionsofcementarestablewithinfiveyearsconditionedwell.2.5Designfstatisticalanalysismethodevaluationprinciple2.5.1RobuststatisticaltechniqueEveryresulthasb

8、eengiveaZvaluewhichiscalculatedasfollowingfmulaZ=(xX)σ(1)WherexisthemeasurementresultofparticipatsXistheassignedvalueσisthestarddeviationfproficiencyassessmentTheprogrammeinvolvesstatisticelementsasnumberofresultsmediann

9、malIQRcoefficientofrobustvariation(Cv)minimum(Min)maximum(Max)range(R).Medianisusedftheassignedvalue(X)nmalIQRfthestarddeviationfproficiencyassessment(σ).Evaluationprincipleftheresultsofparticipatsasfollows∣Z∣≤2thenthere

10、cdedvalueisconsideredascrect2＜∣Z∣＜3thentherecdedvalueisconsideredassuspect∣Z∣≥3thentherecdedvalueisconsideredasanoutlier2.5.2AllowabledeviationbetweenlabsWhentheresultissuspectoutlierallowabledeviationtechniquewillbeused

11、.Ifitsabsolutedeviationisintheallowablerangetheresultwillbeconsideredasqualifiedotherwiseasunqualified.AllowabledeviationsbetweenlabsareprovidedfromstardspecificationofmethodfchemicalanalysisofcementGBT1762008showninTabl

12、e2.Table2AllowabledeviationofcementchemicalanalysisTestingitemsAllowabledeviationTestingitemsAllowabledeviationL.O.I0.25Fe2O30.20IR0.10Al2O30.30SO30.20CaO0.40MgO0.25K2O0.15SiO20.20Na2O0.10Note：Allofallowabledeviationaref