Quality control in potentiometric determination of acid volatile sulfides (AVS) using standard addition

Quimica nova

Fagnani, Enelton¹  Guimarães, José Roberto¹  Fadini, Pedro Sérgio²  Grassi, Marco Tadeu³ 

[1] Universidade Estadual de Campinas, Campinas, Brasil;Universidade Federal de São Carlos, São Carlos, Brasil;Universidade Federal do Paraná, Curitiba, Brasil

关键词: acid volatile sulfides;    quality control;    potentiometry.;   

DOI  :  10.1590/S0100-40422012000400033

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

This paper presents a quality assurance and quality control protocol in order to ensure the reliability of analytical results for the determination of acid volatile sulfides in environmental samples by potentiometry. The monitoring of the ion selective sensor readings must be realized continually and particularly in this situation where the analyte is susceptible to transformation and volatilization. Potentiometry with the standard addition was presented as a rapid, accurate, precise, feasible as well as a low cost technique. Concentrations of the analyte in the range of 0.49 to 1.02 mg L-1 were tested with percentage recoveries varying from 89 to 113%.

【 授权许可】

CC BY