Bone Posted February 10, 2018 Posted February 10, 2018 Hello, my university did not provide Whatman Filter Paper No.40 (ashless), I would like to know is there any alternative way to filter soil + HCl + HNO3 (aqua regia method) to analyze trace element using ICP-OES? Can I just use Whatman No. 1 qualitative? Thank You.
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