I use 3 mL of concentrated HNO3 and 1 mL of concentrated HCl to prepare Aqua Regia. It is a common practice to add 5 mL of aqua regia to 500 mg of well powdered soil sample. It should be noted that further digestion by HClO4 should be carried out to decompose organics. Also the silicate chain should be broken at the initial stages by HF. You may find more and detailed information at EPA site or even USGS.
All The Best
I use 3 mL of concentrated HNO3 and 1 mL of concentrated HCl to prepare Aqua Regia. It is a common practice to add 5 mL of aqua regia to 500 mg of well powdered soil sample. It should be noted that further digestion by HClO4 should be carried out to decompose organics. Also the silicate chain should be broken at the initial stages by HF. You may find more and detailed information at EPA site or even USGS.
All The Best
The exact quantities of acids and time of mineralization often must be determined experimentally. Usually, organic soil require more HNO3 while sandy HF. Try different mixures.
Good luck
The movable metal (Cu, Zn, Ni, Co, Cd, Pb) determined in extracts of
1 M HNO3 or 1 M HCl. Attitude soil to a solution of 1:10, for peat soils - 1:20.
In 2001, the EU co-existed methods of determining the total (HCl + HNO3 / HF / HClO4) and pseudototal (50% HNO3, HCl + HNO3).
Country Method of Extraction of soil samples
Denmark 50% HNO3
France HCl + HNO3 / HF / HClO4
Germany HCl + HNO3 HF / HClO4
England HCl + HNO3
As a result, the EU standardized method for determining the TM according to ISO 11466 [ISO 11466 Soil Quality - Extraction of trace elements soluble in aqua regia //http://www.iso.org/iso/iso_catalogue/catalogue_tc/] is to extraction soil samples "royal vodka» (HCl + HNO3) at reflux followed by atomic absorption or other methods of determining. The method involves the determination of the so-called "pseudototal" forms of TM.
Yes I do analyse asper method given@A. R. Karbassi. 3:1 HNO3:HCl is used H2O2 may also be used OM. Thanks
According to the acid digestion of soil, (Using microwave heating for for the metal determination by spectroscopic methods), You can use 8 mL of HNO3, 5 mL of HCl, and 1.5 mL of HF for
Consider an HF digestion. Here is a very good reference for almost all soil tests.
http://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb1253872.pdf
3:1:1 HNO3, HCl and HF for acid digestion and breaking of silicate bonds. perchloric acid may be used in case of significant organic content. Refer to USEPA 3050 protocol or usda.
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