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this study may require a low detection limit of ppb level, an Atomic Absorption spectroscopy and Inductively Coupled Plasma Mass Spectrometry are utilized in this study. A two-step digestion was used to completely dissolve the waste printed circuit boards for ICP-MS and AA analysis. The sample is initially digested by an aqua regia digestion procedure, as described in Section 4.2.2.1. The remaining solid residue is filtrated and washed by deionized water three times. The dried residue is then treated by a four-acid (HF-HCl-HNO3-H3BO3) digestion procedure detailed in Section 4.2.2.2. 4.2.2.1 Aqua Regia Digestion Procedure The Aqua Regia Digestion procedure was to dissolve the base and precious metals in the circuit boards. The method is illustrated as follows: Weigh and place 50g shredded sample in a 1L beaker with a magnetic stirrer Add 200 mL of concentrated Aqua Regia solution (38% HCl and 70% HNO3), 3:1 HCl:HNO3 by volume Cover the beaker with watch glass Place covered beaker on hotplate, set to 150 °C and 400RPM, for 1.5 hours Add additional 200 mL deionized water to beaker and cover with the watch glass for another 1 hour of stirring Weigh and label filter paper, Whatman No. 42, and record weight Weigh a 500 mL polypropylene bottle and label Filter sample by funnel into the 500 mL polypropylene bottle Rinse filter cake with deionized water three times until no color remains on the paper Weigh the 500 mL polypropylene bottle filled with the filtered solution, add deionized water till the total weight is 600g and mix thoroughly Take 30 mL sample, store in a 50-mL polypropylene vial and label 4.2.2.2 4-Acid Digestion Procedure Given that the aqua regia may not be able to dissolve silica and ceramics that can be found in the waste printed circuit boards, a 4-acid digestion is used as the second stage of digestion to fully dissolve the base and precious metals locked in the silica and ceramics. Due to the geometry waste printed 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 38PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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