Samples dry ashing

Soil Drying of sample, dry ashing, digestion with acid, and dilution with water AAS 2 pg/g 79-103 Beyer and Cromartie 1987... 

Bones Spiked sample dry ashed cleanup by coprecipitation, solvent extraction and electrodeposition a-Spectrometry (isotopic quantification) 0.03 pg/ sample 60-93% Singh and Wrenn 1988 Singh et al. 1984... 

The dissolution and ashing of nail specimens can be carried out using the various procedures described in the case of hair samples. Dry ashing in the LTA and wet digestion in the microwave oven are particularly effective in the case of nail specimens for which determination of the volatile elements is usually required. 

Coal analyses are reported on severalbases, and it is customaiy to select the basis best suited to the application. The as-received basis represents the weight percentage of each constituent in the sample as received in the laboratoiy. The sample itself may be coal as fired, as mined, or as prepared for a particular use. The moisture-free (diy) basis is generally the most useful basis because performance calculations can be easily corrected for the ac tual moisture content at the point of use. The dry, ash-free basis is frequently used to approximate... 

For exposure of reasons of observable discrepancy of results of the analysis simulated experiment with application synthetic reference samples of aerosols [1]. The models have demonstrated absence of significant systematic errors in results XRF. While results AAA and FMA depend on sort of chemical combination of an elements, method of an ashing of a material and mass of silicic acid remaining after an ashing of samples. The investigations performed have shown that silicic acid adsorbs up to 40 % (rel.) ions of metals. The coefficient of a variation V, describing effect of the indicated factors on results of the analysis, varies %) for Mn and Fe from 5 up to 20, for Cu - from 10 up to 40, for Pb - from 10 up to 70, for Co the ambassador of a dry ashing of samples - exceeds 50. At definition Cr by a method AAA the value V reaches 70 %, if element presences an atmosphere in the form of Cr O. At photometric definition Cr (VI) the value V is equal 40%, when the element is present at aerosols in the form of chromates of heavy metals. 

Nineteen bone samples were prepared for analysis of the trace elements strontium (Sr), rubidium (Rb), and zinc (Zn). The outer surface of each bone was removed with an aluminum oxide sanding wheel attached to a Dremel tool and the bone was soaked overnight in a weak acetic acid solution (Krueger and Sullivan 1984, Price et al. 1992). After rinsing to neutrality, the bone was dried then crushed in a mill. Bone powder was dry ashed in a muffle furnace at 700°C for 18 hours. Bone ash was pressed into pellets for analysis by x-ray fluorescence spectrometry. Analyses were carried out in the Department of Geology, University of Calgary. 

Byrne AR, and Kucera J (1991) Radiochemical neutron activation analysis of traces of vanadium in biological samples A comparison of prior dry ashing with post-irradiation wet ashing. Fresenius f Anal Chem 340 48-52. 

Air Sample collection on cellulose filter, dry ashed, solvent extracted Biphasic liquid scintillation 1 pCi 95% Bomben et al. 1994... 

Air Cellulose filter dry ashed, dissolved in HNO3/HF, H202/HCI04, purified with anion exchange, TRU-spec columns followed by electrodeposition. a -Spectroscopy 0.023 pCi/sample 102% Goldstein et al. 1997... 

Applications Quantitative dry ashing (typically at 800 °C to 1200°C for at least 8h), followed by acid dissolution and subsequent measurement of metals in an aqueous solution, is often a difficult task, as such treatment frequently results in loss of analyte (e.g. in the cases of Cd, Zn and P because of their volatility). Nagourney and Madan [20] have compared the ashing/acid dissolution and direct organic solubilisation procedures for stabiliser analysis for the determination of phosphorous in tri-(2,4-di-t-butylphenyl)phosphite. Dry ashing is of limited value for polymer analysis. Crompton [21] has reported the analysis of Li, Na, V and Cu in polyolefins. Similarly, for the determination of A1 and V catalyst residues in polyalkenes and polyalkene copolymers, the sample was ignited and the ash dissolved in acids V5+ was determined photo-absorptiometrically and Al3+ by complexometric titration [22]. 

Tissues (brain, heart, lung, kidney, liver, and testes) Dry ashing of sample dissolution in HN03 AAS No data No data Exon et al. 1979... 

Teeth Dry ashing of sample crushing dry ashing again dissolution in HN03 AAS No data 90-110 Steenhout and Pourtois 1981... 

Agricultural crops Dry ashing of sample with H2S04 and HN03 dilution with water DPASV 0.4 ng/g 85-106 Satzger et al. 1082... 

Grains, milk mussel, fish Bomb digestion of sample with acid and heat or digestion with acid and dry ashing dissolution in acid dilution with water GFAAS 20 pg/g (bomb) 5 pg/g (dry ash) No data 85-107 75-107 Ellen and Van Loon 1990... 

Further reference to Fig. 6 shows that the latter tar yield now plots with the bituminous coals with reference to the effect of the atomic H/C ratio. Similarly a second brown coal sample (Loy Yang) which, as recovered from the seam, has a very low ash yield (0.4% dry ash-free basis), and most of the carboxyl groups in the acid form, plots with the bituminous coals in Fig. 6 however, when the sodium-salt is produced from this coal before flash pyrolysis the tar yield is almost complete supressed. 

Dry-ashing Ignition of organic matter in a furnace. Resulting ash dissolved in acid for further analysis Metals in organic solid samples (e.g. metals in foodstuffs)... 

These samples are prepared by either wet or dry ashing. Many of the metals can be determined in aqueous solution, but for the more trace ones, solvent extraction procedures similar to those described above are resorted to. Similar sample preparation procedures apply to plants. The elements... 

HS-I diet and fecal samples were dry ashed and HS-II and -III samples were prepared by a combination dry-wet ashing procedure (Hill et al. unpublished). The approved method of American Association of Cereal Chemists (7) was used for determining neutral detergent fiber. 

Olsen et al. [71] have reviewed the determination of inorganic, organic and total phosphorus in soil and sediments. Determination of total phosphorus in aqueous samples commonly involves a hot acid oxidation type digestion procedure, although various other dry-ashing, fusion and UV... 

Alternatively 0.5g samples were dry ashed using magnesium nitrate as an ashing aid [168] to prevent volatilization losses of selenium. The solution was diluted to 50mL. Total selenium was determined by using 50pL aliquots diluted to 5mL with 0.5M hydrochloric acid. 

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