However in aqua regia
and nitric acid its amount was 12.502 and 6.920 ppm respectively.
The results demonstrate the reliability of the aqua regia
method for heavy element analysis although concentrations were high which may be attributed to various factors like acid interference, external contaminations (although a blank was used as a precaution), and technical errors.
Heavy metal concentrations (mg/kg) of soils by aqua regia
digestion Samples Cu Zn Cd Pb Sites No.
Briefly, the samples were digested with 10 ml of HFfor one hour, and with 20ml of aqua regia
Cold vapor S (Method Code: CV02) were used for Mercury (Hg) determination and ICP-OES method (Code: IC01) were used after aqua regia
digest for Ag, As, Bi, Cu, Mo, Pb, Sb, Te & Zn.
The concentration of Pb in samples was found to be in the range of 43-58.5, 26-35.5, 17- 30, 11-18.5, 22-30.5, 27-37.5, 36-48 and 2- 6.5 mg/kg by 1MW (microwave- assisted wet digestion), 2AW (wet digestion with HNO3 and H2O2 mixture), 2BW (wet digestion with mixture of HNO3 and HClO4), 2CW (wet digestion with aqua regia
), 2DW (wet digestion with reverse aqua regia
), 2EW (wet digestion with mixture of HNO3 and H2SO4), 2FW (wet digestion with mixture of HNO3 and HF) and 3DD (Dry digestion in Muffle furnace), respectively.
It will even resist Aqua Regia
at room temperature; particularly notable as this mixture of hydrochloric and nitric acids is capable of dissolving noble gold.
17 Which two acids are combined to make aqua regia
, one of the few reagents able to dissolve gold?
These days she contributes her verse and commentary to madpoetry.org and has her own website at www.fibitz.com "Aqua Regia
" is a little chapbook compendium of her own very special prose poetry that entertains, reminisces, and occasional inspires thoughtful reflection.
The elemental composition of the sediments was measured by ICP-OES following an aqua regia
(3 : 1 HCl : HN[O.sub.3]) microwave digestion.
Prepared samples are then shipped to MS Analytical Services (MSA), an ISO 9001-2008 laboratory in Langley, BC, Canada, where samples are assayed for a multi-element suite (MSA code IMS-136, 15.0 g split, Aqua Regia
digestion, ICP-AES/MS finish) and gold by Fire Assay (MSA code FAS-111, 30 g fusion, AAS finish).