Multicommutation in flow analysis .4. Computer-assisted splitting for spectrophotometric determination of copper and zinc in plants

被引:17
作者
Oliveira, CC [1 ]
Sartini, RP [1 ]
Reis, BF [1 ]
Zagatto, EAG [1 ]
机构
[1] UNIV SAO PAULO, CTR ENERGIA NUCL AGR, BR-13400970 PIRACICABA, SP, BRAZIL
基金
巴西圣保罗研究基金会;
关键词
flow analysis; multicommutation; splitting; differential kinetic analysis;
D O I
10.1016/0003-2670(96)00237-1
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
An improved splitting process in flow analysis accomplished by means of a computer controlled three-way solenoid valve is proposed. This valve is located at the splitting site, and defines the flow pattern and the portions of the processed sample delivered to each emergent stream. As an application, the simultaneous spectrophotometric determination of copper and zinc in plant digests was selected. The method is based on metal complexation with cyanide, differential kinetics of decomplexation, and reaction with Zincon. The proposed system is very stable and handles 45 samples per hour which corresponds to 0.27 mg Zincon per determination. Precise measurements (r.s.d.=0.7% and 1.7% for first and second peaks) are obtained within 0.00-1.00mgl(-1) Cu and 0.00-2.00mgl(-1) Zn. Detection limits are 0.05 and 0.04mgl(-1) for Cu and Zn. Results are in agreement with standard reference materials.
引用
收藏
页码:173 / 178
页数:6
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