Modern Analytical Facilities 2. A Review of Quality Assurance and Quality Control (QA/QC) Procedures for Lithogeochemical Data

摘要: Quality assurance and quality control (QA/QC) are critical components of modern analytical geochemistry.  A properly constructed QA/QC program identifies both the source error provides a means establishing confidence in assessing limitations data. involves monitoring precision, accuracy, potential contamination from sampling to analysis.  Precision can be monitored via systematic insertion sample, pulp, duplicates, reference materials; resulting data subsequently evaluated using scatterplots, statistical tests (e.g. % relative standard deviation), Thompson-Howarth plots, average coefficient variation (CV avg (%)).  Accuracy is determined through submission materials difference, t-test) Shewart charts.   Blanks test results charts. SOMMAIRE L'assurance de la qualite et le controle (AQ-CQ) sont deux composantes essentielles geochimie analytique moderne.  Un programme AQ-CQ bien concu defini fois l'erreur d'analyse un moyen d'etablir confiance d’evaluer les limites des donnees analytiques.  comprend l'exactitude potentielle, l'etape d’echantillonnage l'analyse.  La precision peut etre controlee l'insertion systematique d'echantillon, pulpes, doublons d'analyse, materiaux reference; obtenues ensuite evaluees en utilisant diagrammes dispersion, statistiques (pourcentage d’ecart type relatif, par ex.), courbes Thompson-Howarth, des  coefficients moyens m %).  est determinee soumission documents (difference %, t-test, ex.) graphiques Shewhart.  d’essais blanc resultats controles Shewhart.