Abstract
Cadmium and nickel are determined in coal, coal fly ash and urban particulate matter reference materials using solid sampling graphite furnace AAS. The evaluation of integrated absorbance is required to overcome the effect of the matrix on the rate of atomization. The homogeneity of the samples under investigation in the range between 0.3 mg and 1.5 mg sample weight is good enough to make possible relative standard deviations around 10% for cadmium and between 10 and 20% for nickel. Cadmium can be determined against reference solutions, the nickel results are slightly lower than the certified value if calibration is performed against aqueous solutions. Calibration against a solid reference is therefore recommended. Less sensitive resonance lines and an internal gas flow through the tube are required for some of the samples to keep the absorbance in the linear calibration range. The direct determination of chromium in these samples is hampered by the lack of less sensitive resonance lines. Due to high concentrations of chromium in the samples, direct determination without dilution of the sample e.g. by spectrally pure graphite powder is impossible. The peak for the refractory carbide forming element vanadium is strongly suppressed by the coal and urban particulate matrix.
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Citation Formats
Schlemmer, G, and Welz, B.
Determination of heavy metals in environmental reference materials using solid sampling graphite furnace AAS.
Germany: N. p.,
1987.
Web.
Schlemmer, G, & Welz, B.
Determination of heavy metals in environmental reference materials using solid sampling graphite furnace AAS.
Germany.
Schlemmer, G, and Welz, B.
1987.
"Determination of heavy metals in environmental reference materials using solid sampling graphite furnace AAS."
Germany.
@misc{etde_5890404,
title = {Determination of heavy metals in environmental reference materials using solid sampling graphite furnace AAS}
author = {Schlemmer, G, and Welz, B}
abstractNote = {Cadmium and nickel are determined in coal, coal fly ash and urban particulate matter reference materials using solid sampling graphite furnace AAS. The evaluation of integrated absorbance is required to overcome the effect of the matrix on the rate of atomization. The homogeneity of the samples under investigation in the range between 0.3 mg and 1.5 mg sample weight is good enough to make possible relative standard deviations around 10% for cadmium and between 10 and 20% for nickel. Cadmium can be determined against reference solutions, the nickel results are slightly lower than the certified value if calibration is performed against aqueous solutions. Calibration against a solid reference is therefore recommended. Less sensitive resonance lines and an internal gas flow through the tube are required for some of the samples to keep the absorbance in the linear calibration range. The direct determination of chromium in these samples is hampered by the lack of less sensitive resonance lines. Due to high concentrations of chromium in the samples, direct determination without dilution of the sample e.g. by spectrally pure graphite powder is impossible. The peak for the refractory carbide forming element vanadium is strongly suppressed by the coal and urban particulate matrix. Integration of the signal within a reasonable time and at an atomization temperature of 2650/sup 0/C is impossible.}
journal = []
volume = {328:4/5}
place = {Germany}
year = {1987}
month = {Sep}
}
title = {Determination of heavy metals in environmental reference materials using solid sampling graphite furnace AAS}
author = {Schlemmer, G, and Welz, B}
abstractNote = {Cadmium and nickel are determined in coal, coal fly ash and urban particulate matter reference materials using solid sampling graphite furnace AAS. The evaluation of integrated absorbance is required to overcome the effect of the matrix on the rate of atomization. The homogeneity of the samples under investigation in the range between 0.3 mg and 1.5 mg sample weight is good enough to make possible relative standard deviations around 10% for cadmium and between 10 and 20% for nickel. Cadmium can be determined against reference solutions, the nickel results are slightly lower than the certified value if calibration is performed against aqueous solutions. Calibration against a solid reference is therefore recommended. Less sensitive resonance lines and an internal gas flow through the tube are required for some of the samples to keep the absorbance in the linear calibration range. The direct determination of chromium in these samples is hampered by the lack of less sensitive resonance lines. Due to high concentrations of chromium in the samples, direct determination without dilution of the sample e.g. by spectrally pure graphite powder is impossible. The peak for the refractory carbide forming element vanadium is strongly suppressed by the coal and urban particulate matrix. Integration of the signal within a reasonable time and at an atomization temperature of 2650/sup 0/C is impossible.}
journal = []
volume = {328:4/5}
place = {Germany}
year = {1987}
month = {Sep}
}