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How anodic stripping voltammetry works for analysis of chromate. How is the analytical signal generated?
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- Why is glass better than fused silica as a prism construction material for a monochromator to be used in the region of 400 to 80 nm?Describe the principle and operation of anodic stripping voltammetry (ASV). How does it differ from adsorptive stripping voltammetry? What is the quantitative signal?Explain why Anodic Stripping Voltammetry (ASV) is considered superior over analytical techniques in terms of detection limit.
- The standard addition technique was used for the voltammetric analysis of a Cd2+ sample. From the data listed in the table below, calculate the concentration of the Cd2+ in the sample.When using ion-selective electrodes, to comensate for a complex or unknown matrix, the __________ method can be used to determine the analyte concentration. a) least-squares analysis b) standardization c)standard addition d)dilution e)calibration curveWhat is the purpose of adding the KSCN near the end of the unknown analysis of copper using indirect iodometic analysis?
- The table shows a series of standard additions of Cu(II)to acidified water samples measured by anodic stripping voltammetry at a platinum electrode. The unknown and all standard additions were made up to the same final volume. 1. What chemical reaction occurs during the concentration stage of the analysis?2. What chemical reaction occurs during the stripping stage of the analysis?3. Plot absorbance as a function of the concentration of Cu (II) standard. Determine the equation of theline and the X intercept. Find the concentration of Cu(II) in the water.In an analysis of chromium in steel containing 1.76% Cr. 0.5000 g of that steel is weighed and dissolved in acid, whereupon the Cr is oxidized to Cr2O72- (dichromate), and blunt to a volume of 250 mL. A 10 mL aliquot of this solution is diluted with water and acid to a final volume of 100 mL. The resulting solution shows a transmittance of 41.7% in a 1 cm pathlength cell. When a 0.7500 g sample of unknown steel is dissolved in acid, oxidized, and diluted to 250 mL, the resulting solution exhibits a transmittance of 61.3% under identical experimental conditions. What is the percentage of Cr in the steel?Discuss how the hollow cathode lamp can increase AAS selectivity.
- Calculate the absorbance of 2.65*10-5 M solution of the complex at this wavelength using a 1.5 cm cellCan electrogravimetry give total copper concentration and determine the concentration of specific species of either Cu(II) or Cu (I)? Why? And does it require a standard calibration curve? If not, how can the amount of analyte be determined?What about Polarography?Graphite furnace atomizers are renowned in Atomic Absorption Spectrometry for their exceptionally low detection limits (10-12 g and lower for many elements). Why are detectabilities so much better with graphite furnaces than with flame atom cells in AAS?