Multicommuted flow system for ammonium and monochloramine determinations in wastewater and disinfection products

Química Nova

Korn, Mauro¹  Borges, Sivanildo da Silva¹  Acevedo, Maria Soledad Moura Soares Fernandez¹  Universidade Federal do Recôncavo da Bahia, Cruz das Almas, Brasil¹  Universidade do Estado da Bahia, Salvador, Brasil¹ 

关键词: monochloramine determination;    ammonium determination;    multicommutation.;   

DOI  :  10.1590/S0100-40422009000500017

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

A binary sampling flow analysis system equipped with gas diffusion cell was developed for NH4+ and/or NH2Cl determination in wastewater and disinfection products samples based on the Berthelot reaction of the NH2Cl diffused through the semi-permeable PTFE membrane. The effect of the analytical conditions related to the reaction and flow parameters were evaluated and N-NH4+ and N-NH2Cl were determined in concentration ranges from 0.17 to 5 mg L-1 and from 0.5 to 14.5 mg L-1, respectively. Limits of detection (3σ) of 50 and 140 µg L-1 for N-NH4+ and N-NH2Cl were calculated, respectively, and RSD of 5 and 2% were calculated for 10 consecutive determinations of N-NH4+ (1 and 3 mg L-1) and N-NH2Cl (3 and 9 mg L-1), respectively with 30 determinations h-1.

【 授权许可】

Unknown