aqua regia


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ni·tro·hy·dro·chlor·ic ac·id

(nī'trō-hī'drō-klōr'ik as'id),
An extremely caustic mixture that contains 18 parts nitric acid and 82 parts hydrochloric acid.

aqua regia

Latin for a fuming, highly corrosive mixture of nitric and hydrochloric acids in a 1:3 ratio, so known as it dissolves noble (regal) metals gold and platinum.
References in periodicals archive ?
The aqua regia method of analysis is susceptible to acid interference, which makes it unreliable if used alone.
However, further research and testing led to the development of a caustic fusion protocol, a thiosulphate leach process and, more recently, a modified fire assay method that did extract economically significant values of gold and silver as "metal-in-hand," from samples where conventional fire assay, aqua regia leach and cyanide leach extracted very low values.
Rock grab samples from all zones, collected during 2007 ground evaluation, were submitted to Saskatchewan Research Council of Saskatoon for analysis using aqua regia partial digestion followed by ICP.
Antimony assays were completed by GAR Aqua Regia Digestion and Flame AA finish.
Assaying is by 30 g fire assay with AA finish for Au and further 6 elements by aqua regia digestion.
AA45 is the determination of silver by aqua regia digestion and AAS finish.
Assaying is by 30 g fire assay with AA finish for Au and 34 elements by aqua regia digestion and ICPES for Ag, Cu and other base metals.
A 30 gram split of each pulp fraction was then digested by 2-2-2 aqua regia at 95 degrees for one hour, diluted to 600ml and analysed for 30 elements by ICP-MS spectrometry.
Samples were assayed at ALS Chemex Laboratories in Vancouver where the analytical procedure consists of pulverizing split samples followed by aqua regia digestion and atomic absorption finish.