Wet-ashing

The combination of oxidi2ing effect, acidic strength, and high solubiHty of salts makes perchloric acid a valuable analytical reagent. It is often employed in studies where the absence of complex ions must be ensured. The value of wet ashing techniques, in which perchloric acid is used to destroy organics prior to elemental analysis for the determination of trace metals in organics, has been well estabHshed (see Trace and residue analysis). [Pg.65]

Samples which are viscous (e.g. oils, blood, blood serum) require dilution with a solvent, or alternatively must be wet ashed before the sample can be nebulised. [Pg.787]

Raw foods were freeze-dried and analyzed for carbon isotopes using mass spectrometry. Cooked foods were prepared following historic recipes, then were freeze-dried prior to analysis. For the trace element analysis, foods (both raw and cooked) were wet ashed using nitric acid in Teflon lined pressure vessels and digested in a CEM Microwave oven. Analysis of Sr, Zn, Fe, Ca and Mg was performed using Atomic Absorption Spectrometry in the Department of Geology, University of Calgary. [Pg.5]

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. [Pg.101]

Using the slurry-method and GF-AAS in Cu, Cr, Fe and Pb were determined in various pine needle samples, using NIST SRM 1575 Pine needles slurry as calibrant. Comparison of the obtained results showed good agreement with wet ashing (Carrion et al. 1988). [Pg.140]

Urine Sample wet ashed, treated with HN03 and h2o2 a -Liquid scintillation 0.7 pCi/125 cm3 95% at 0.01-1,000 nCi Guilmette and Bay 1981... [Pg.200]

Urine Sample wet ashed, purified by solvent extraction Liquid scintillation 14 pCi/100 cm3 96% at 20,000 dpm spike Ham et al. 1977... [Pg.200]

Urine Sample cleaned-up by coprecipitation, treated with HN03 and H202, wet ashed Biphasic liquid scintillation 1 pCi/200 cm3 84% Bomben et al. 1994... [Pg.200]

Soft tissue Sample wet ashed, spiked with 243Am, purified by anion exchange, solvent extraction, and electrodeposition a -Spectrometry No data 98% Mclnroy et al. 1985... [Pg.201]

Soft tissue Spiked sample wet ashed, treated with HN03/H202, purified by A-CU column, anion exchange, TRU-spec column, and electrodeposition a -Spectrometry No data 53% Qu et al. 1998... [Pg.201]

Air Filter wet ashed in HNO3/HF, purified with cation and anion exchange columns and electrodeposition a -Spectroscopy No data No data Knab1979... [Pg.209]

Blood Wet ashing with acid mixtures residue dissolution in dilute HCI04 ASV with mercury-graphite electrode (NIOSH method P CAM 195) 40 pg/L 95-105 NIOSH 1977d... [Pg.445]

Blood Wet ashing with HN03 residue dissolution in dilute HN03 GFAAS (NIOSH method P CAM 214) 100 pg/L No data NIOSH 1977g... [Pg.445]

Blood and urine Wet ashing of sample with HN03, complexation with diphenylthio-carbazone, and extraction with chloroform Spectrophotometry (NIOSH method P CAM 102) 30 pg/L (blood) 12 pg/L (urine) 97 97 NIOSH 1977a... [Pg.445]

Brain Wet ashing of sample with mixture of acids, mixing with Metex and analysis ASV No data No data Jason and Kellogg 1981... [Pg.447]

Hair Cleaning of sample with hexane, ethanol, and water wet ashing with HNQ3 and H202 ICP/AES No data No data Thatcher et al. 1982... [Pg.448]

Tissues. Lead has been quantified in a variety of tissues, including liver, kidney, brain, heart, lung, muscle, and testes. Techniques for measuring lead in tissues are similar to those used for blood and urine. When AAS, GFAAS, or ASV are used for analysis, the samples may be wet ashed, digested with acid, or bomb digested (Blakley and Archer 1982 Blakley et al. 1982 Ellen and Van Loon 1990 Exon et... [Pg.449]

Air (particulate lead) Collection of particulate matter onto membrane filter wet ashing with HN03/ HCI04/ H2S04 dissolution in acetate buffer ASV with mercury-graphite electrode (Method P CAM 191) 0.16 pg/m3 90-110 NIOSH 1977c... [Pg.452]

Water (particulate and dissolved lead) Filtration of water through a 0.45 pm membrane filter (dissolved lead) particulate material dissolved by wet ashing (insoluble ICP/AES (EPA Method 200.7) 42 pg/L 94-125 EPA 1983a... [Pg.452]

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