A Simple Automated Method for the Determination of Nitrate and Nitrite in Infant Formula and Milk Powder Using  Sequential Injection Analysis

<table>System for sequential injection analysis determinations. Sy: syringe pump, 2.5 mL. S: sample. R<sub>1</sub>: color reagent. V<sub>1</sub>: selector valve with microelectric actuator. V<sub>2</sub>: two-position valve associated with the syringe pump. HC<sub>1</sub>, HC<sub>2</sub>: holding coils, 100 cm × 0.8 mm ID, PFA tubing. Cd/Cu: reducing minicolumn, 50 mm × 2.1 mm ID packed with cadmium granules. C<sub>1</sub>: mixing coil, 50 cm x 0.8 mm ID, PFA tubing. D: detection system, spectrophotometer (540 nm) with 200 <svg height="9.6750002" id="M3" style="vertical-align:-2.29482pt" version="1.1" viewbox="0 0 9.6374998 9.6750002" width="9.6374998" xmlns="http://www.w3.org/2000/svg">
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Journal of Analytical Methods in Chemistry

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Figure 1

Figure 1: A Simple Automated Method for the Determination of Nitrate and Nitrite in Infant Formula and Milk Powder Using  Sequential Injection Analysis 

Figure 1 | A Simple Automated Method for the Determination of Nitrate and Nitrite in Infant Formula and Milk Powder Using  Sequential Injection Analysis 