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Sample Digestion Methods for the Determination of Traces

digestion procedure with the separation and detection steps determines the reliability of the results The problem of choosing the procedure for the digestion of the examined samples remains a fundamental one in spite of a huge amount of work done to develop accurate methods for the determination of precious metals in various materials TheGet price

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Determining Platinum Palladium and Rhodium in Automotive

Analytical labs often employ an Aqua Regia digestion process using a microwave digestion system so that the crushed and milled substrates of the catalytic converters are amenable for determining their active metal content by inductively coupled plasma spectrometry Get price

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Metals Analysis

not fully digest Reverse Aqua Regia Digestion for Soils and Sludge – Total Metals Samples are digested in a hot acid solution of Nitric acid and Hg free Hydrochloric acid to extract total metals This digest must be used for soils Acid leach of ceramics A leaching solution of acetic acid is Get price

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Large Scale Gold Refining By the Aqua Regia Acid Method

Details of the hood used in this work are given in 4 Fume Hoods Aqua regia is a combination of nitric acid and hydrochloric acid (the industrial grade of hydrochloric is sometimes called muriatic acid) it is made by mixing 1 volume of concentrated nitric acid with 4 volumes of concentrated hydrochloric acid Get price

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Comparison of Three Aqua Regia Digestion Methods for

wave aqua regia 1 HF digestion was overall the best procedure for digestion using a Teflon bomb is considered a rapid determining concentrations of most metals in SRMs and Florida soils sample digestion method (Marr et al 1995 Nieuwenhu- followed by the microwave aqua regia and the hotplate aqua regia digestion Get price

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Microwave

The microwave energy is created by one magnetron and is directed to the pressurized digestion cavity The microwaves are splitted and directed upwards in a circle to the cavity Due to this splitting the spot in the middle of the PDC can be used for a temperature sensor and/or stirring device Get price

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Determination Of Sulfur in Canola Seed by Inductively

rigorous sample digestion using HClO 4 aqua regia or HF was necessary1 which poses safety concerns In addition the interference of minerals could not be removed by any digestion Here we present an improved method which is safe and efficient for canola seed Sulfur was quantified byGet price

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Determination of metals in base metal ores using the

Canada) The target analytes and digestion method for each ore sample and CRM are summarized in Table 3 Various acid mixtures were used for digestion depending on the nature of the ores Aqua regia digestions used a mixture of 6 mL HCl and 2 mL HNO 3 Reverse aqua regia digestion used a mixture of 6 mL HNO 3 and 2 mL HCl Phosphoric acid digestion usedGet price

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How to Digest 316 Stainless Steel for ICP Analysis Using

Digestion Procedure 5 separate 0 5g aliquots of CRM IARM 5I were prepared using 20ml of aqua regia in a quartz digestion tube The 5 digestion vessels were loaded into a 6 position ColdBlock digestion system and digested for 15 minutes at 28% power Get price

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Evaluation of the Effectiveness of Different Acid

being superior to microwave-assisted and aqua regia digestions important compost constituents [20] Heavy metals in the silicate mineral require digestion with hydrofluoric acid (HF) and strong acids However the use of HF in routine laboratories is not recommended as it is Get price

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BS EN 13657

The obtained results of aqua regia soluble elements cannot be regarded as available for leaching as the digestion with aqua regia is too vigorous to represent natural processes 4 EN 13657 2002 (E) 1 Scope This European Standard specifies methods of digestion with aqua regia Get price

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Comparison of different extraction methods to determine

beakers (250 ml each) and freshly prepared aqua regia (30 ml) was added to stabilize AuCl 3 complex during evaporation on a hot plate Each beaker was covered with a watch glass and heated on a hot plate Heating was continued for at least 4 h and enough aqua regia was added at regular intervals to maintain the freeGet price

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Microwave

Mar 01 2012Read Microwave-assisted aqua regia digestion for determining platinum palladium rhodium and lead in catalyst materials Microchemical Journal on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips Get price

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Evaluation of Some Digestion Methods for the Determination

Aug 22 2006The best digestion method involves the use of reverse aqua regia HNO 3-HCl (3 1) with 45 minutes ultrasonification at 60 C followed by hotplate treatment for 45 minutes This method has been successfully demonstrated for the nine heavy metals in two reference sediments with recoveries of 71-102% for SRM 2704 Buffalo River sediment and 85-105% for the AGAL-11 reference sediment from Get price

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Aqua Regia

Aqua Regia This partial digestion uses a mixture of hydrochloric and nitric acids to dissolve sulphides some oxides and some altered silicates Generally base metals will be totally dissolved but this depends on mineralogy (not silicate Ni or Zn in gahnite) This digestion can be used for Cu Pb Zn Ni Co and Ag Get price

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What metals aren't dissolved in/attacked by aqua regia?

Aqua regia (Latin Royal Water) is one of the strongest acids known in Chemistry and is capable of dissolving gold and platinum My copy of the Oxford science dictionary goes on to say (under the entry Aqua regia) that metallic silver does not dissolve in aqua regia Get price

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Determination of Heavy Metals in Soils Sediments and

digested by using a microwave power progressively increasing up to 400W during 40min After cooling the solutions were accurately diluted to 100ml with water In addition an open digestion in a glass beaker was performed with 0 5g of sample accurately weighed by heating with 12ml of aqua regia for 45min followed by evaporation almost to dryness Get price

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Comparative study of three digestion methods for elemental

Jan 30 2016Comparative study of three digestion methods for elemental analysis in traditional medicine products using atomic absorption spectrometry Aqua regia has been proposed as the best digestion -qin M Determination of major and trace elements in six herbal drugs for relieving heat and toxicity by ICP-AES with microwave digestion J Saudi Get price

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13 SAMPLE DISSOLUTION

Sample Dissolution MARLAP 13-12 JULY 2004 LITHIUM METABORATE (LiBO2) or a mixture of the meta- and tetraborates is a more basic flux and is better for dissolving highly acidic oxides or very insoluble ones such as silica (SiO2) or rutile (TiO2) The metaborate is Get price

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Determination of Heavy Metals in Tilapia using Various

Aqua regia digestion is an effective way of digesting under wet digestion According to this method a mixture of HCl acid and HNO3 in the ratio of 3 1 which is known as aqua regia mixture will be used for the digestion process The sample in the digestion tube will Get price

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The role of different soil sample digestion

Jan 18 2007The ISO standard on aqua regia digestion of soil includes only digestion by the use of hot plate heating while the modified aqua regia digestion method suggested by the Italian legislation includes both hot-plate heating and microwave-oven heating The aqua regia modified method adds in the first step hydrogen peroxide (H 2 O 2) in order to enhance the destruction of the organic matter in Get price

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Sample Digestion Methods for the Determination of Traces

digestion procedure with the separation and detection steps determines the reliability of the results The problem of choosing the procedure for the digestion of the examined samples remains a fundamental one in spite of a huge amount of work done to develop accurate methods for the determination of precious metals in various materials TheGet price

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US3856507A

The aqua regia is formed by mixing 425ml of concentrated hydrochloric acid and 150 ml of concentrated nitric acid The resulting mixture is stirred and heated to about 40C The gold completely dissolves in the aqua regia to form a clear golden-colored solution The solution is cooled to room temperature Get price

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Aqua Regia Handling and Disposal Procedures

Aqua Regia Handling and Disposal Procedures Aqua regia is commonly used to remove minor organic contaminants from glass or noble metal substrates as in microfabrications and microelectronics labs Aqua regia solutions are extremely corrosive and may result in explosion or skin burns if not handled with extreme caution Get price

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Microwave digestion

Microwave Digestion Extraction volume minimum 5 ml typically 10 ml Acid solution typically nitric acid hydrochloric acid aqua regia or acid+water Temperature typically 180 C - 200 C depending upon sample type Duration ramp to temperature holding and cool down can take 30-60 minutes depending upon selected program SampleGet price

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Determination of Cd Cu Pb and Zn in

Fig 2 shows the comparison of microwave total digestion (procedure B) versus aqua regia digestion for some samples which showed ing and with an increasing organic matter content up to 88% As in the previous case the mean values obtained for all samples and studied metals agreed in most cases Get price

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Comparison of aqua regia digestion with reflux systems

Introduction -The reference method for aqua regia extraction is the reflux method (DIN ISO 11466) -Some years ago it was discussed at the meeting of the Heads of the Labs also toaccept microwave digestion Results from France (see later) and Germany (German forest ring test) showed that for different elements the results areGet price

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Comparison of digestion methods for total content of

Since the 1980s microwave-assisted sample digestion techniques have become popular and are widely used Microwave-assisted aqua regia digestion using a Teflon bomb is considered a rapid sample digestion method This technique provides a rapid safe and efficient digestion and is not susceptible to losses of volatile metals [14] Get price

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MICROWAVE

Aqua-regia-based digests give consistently high recoveries for base metals readily decomposing sulphides and most organic matter Being a single-stage procedure MAD aqua-regia digestion provides a cost-effective means of obtaining a wide range of information for the explorer for example in LabWest's 20-element gold-and base-metals exploration package "EXPRESS GOLD+20" Get price

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DEPARTMENT OF THE INTERIOR U S GEOLOGICAL SURVEY A

A total of 51 geologic reference materials including rocks stream sediments sulfide ores and soils were analyzed in evaluating a procedure for the rapid decomposition of geologic samples The decomposition procedure consists of an HC1-HN03-HF polycarbonate-bomb Get price

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Comisso 2 4 Qumica do solo INFLUENCE OF DIGESTION

3051A) nitric-perchloric digestion with HNO 3 + HClO 4 in a digestion block (NP) dry ashing in a muffle furnace and solubilization of residual ash in nitric acid (MDA) digestion by using aqua regia solution (HCl HNO 3) in the digestion block (AR) and acid digestion with Get price

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