Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Property Atomic Absorption (AA) Temperature limits 1,800–3,100 K Ionization Matrix effect Multi-elements Sensitivity Cost Solution viscosity Application to plating solutions Analysis of waste streams Suspended solids in solution Partial Yes Yes, limited ppm levels Lower Interferes due to viscosity, solution diluted Yes Yes Analyze after micro-filtration Analysis versatility Main component Inductively Coupled Plasma (ICP) 700 K Complete None Many elements analyzed simultaneously ppb levels Too costly Interferes due to viscosity, solution diluted Yes Yes Analyze after micro-filtration Main component and trace levels Table 1: Atomic Absorption (AA) vs. Inductively Coupled Plasma (ICP) of analysis, and any additions made for replenishment should be maintained, preferably using commercial software programs such as True Logic or Lab Wizard Software. Small job shops are urged to maintain paper copies for each shift, as well as any notes from troubleshooting operations. Bulk ingredients in the baths are easily determined mostly using titrimetric methods, which require simple laboratory equipment. Trace impurities in solutions may be determined by a certified laboratory equipped with the desired instrumentation for micro- determinations SAMPLING Sampling is an extremely important step, and the sample should be representa- tive of a given tank. Tanks should be identified and their levels recorded to check the decrease in tank volume due to evaporation, drag-out, or spillage. Ideally, sampling should be done at 10 different locations in larger tanks, and a composite sample should be prepared. The log sheet should have entries such as: 1. Tank ID 2. Date and time of analysis 3. Analytical method used 4. Results 5. Recommended high and low limits 6. Analyst signature 449

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