Research Article
A Highly Sensitive Multicommuted Flow Analysis Procedure for Photometric Determination of Molybdenum in Plant Materials without a Solvent Extraction Step
Figure 1
Diagram of the flow system manifold. S1 and S2 = syringes; , , and V3 = three-way solenoid valve; V1 and V2 = two-way solenoid; pumping flow rate at 50 μLs−1; A = sample; R = reagent (SnCl2 and KSCN); Cs = carrier solution (hydrochloric acid 1.5 mol L−1); B = reaction coil, 100 cm long and 0.8 mm inner diameter; Det = photometer, nm; W = waste; T1, T2, T3, , and = switching time diagram for valves V1, V2, V3, , and , respectively. Dashed and solid lines in the valve symbols indicate the fluid pathway when the valves were switched on or off, respectively. Dashed lines in the symbols of valves V1 and V2 indicate that they are normally closed, therefore permitting fluid stream through them only when they are switched on. The shadow surfaces beneath the time lines (T1, T2, T3, , and ) indicate that the respective device is switched on. St0 = stand by condition; St1 and St2 = sampling and signal reading steps, respectively.