Metal Finishing Guide Book


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Property Atomic Absorption (AA) Inductively Coupled Plasma (ICP) Temperature limits 1,800���3,100 K 700 K Ionization Partial Complete Matrix effect Yes None Multi-elements Yes, limited Many elements analyzed simultaneously Sensitivity ppm levels ppb levels Cost Lower Too costly Solution viscosity Interferes due to viscosity, solution diluted Interferes due to viscosity, solution diluted Application to plating solutions Yes Yes Analysis of waste streams Yes Yes Suspended solids in solution Analyze after micro-filtration Analyze after micro-filtration Analysis versatility Main component 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 microdeterminations SAMPLING Sampling is an extremely important step, and the sample should be representative 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 511

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