Simultaneous assay of nitrite, nitrate and chloride in meat products by flow injection

被引:18
作者
Ferreira, IMPLVO
Lima, JLFC
Montenegro, MCBSM
Olmos, RP
Rios, A
机构
[1] UP, FAC FARM, CEQUP, DEPT QUIM FIS, P-4050 OPORTO, PORTUGAL
[2] ESCUELA UNIV INGN TECN IND, DEPT QUIM ANAL, BILBAO 48012, SPAIN
关键词
flow injection; nitrite; nitrate; chloride; meat products; spectrophotometry; potentiometry;
D O I
10.1039/an9962101393
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A flow injection (FI) analytical method for the simultaneous assay of nitrite, nitrate and chloride in meat products is reported, The method is based on the potentiometric determination of chloride using a tubular ISE and on the spectrophotometric determination of nitrite. The FI system consisted in splitting the flow after potentiometric detection using a tubular detector and the subsequent confluence of the flow before reaching the spectrophotometric detector, This allowed the reduction of nitrate to nitrite in part of the sample plug on an on-line copper cadmium reductor column. Since each channel had a different residence time, two peaks were obtained for nitrite and nitrite plus nitrate, Spectrophotometric determination was made after a diazotization-coupling reaction. The results obtained were in good agreement with reference procedures and showed adequate precision (RSDs less than 6% for chloride and nitrite and 2% for nitrate). A high sampling rate was obtained (120 determinations per hour corresponding to 40 samples per hour).
引用
收藏
页码:1393 / 1396
页数:4
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