Analytisch chemische aspecten van de bepaling van aluminium en beryllium in grond- en drinkwater met ICP-MS
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Series / Report no.
Open Access
Type
Report
Language
nl
Date
1994-12-31
Research Projects
Organizational Units
Journal Issue
Title
Analytisch chemische aspecten van de bepaling van
aluminium en beryllium in grond- en drinkwater met
ICP-MS
Translated Title
Analytical chemical aspects of the determination
of aluminum and beryllium in ground and drinking-water by
ICP-MS
Published in
Abstract
In dit onderzoek werd een ICP-MS-methode ontwikkeld
voor de bepaling van beryllium en aluminium in grond- en drinkwater. Onder
de gekozen condities wordt een onderste analysegrens van 50 ng/l Be en 2
mug/l Al bereikt, mits de nodige voorzorgs-maatregelen worden getroffen om
Al contaminatie te voorkomen. De precisie is beter dan 2% RSD voor hogere
concentraties. Spectrale storingen ten gevolge van de meest voorkomende
ionen in grondwater zijn verwaarloosbaar. Matrixeffecten zijn afwezig of
kunnen gereduceerd worden tot verwaarloosbare nivo's indien de monsters
verdund worden tot minder dan 5 muM Ba, 10 mM Ca, 1 mM Fe, 5 mM K, 5 mM Mg,
20 mM Na, 2 mM Si of 4 mM SO4. De kalibratielijn voor Be is lineair tot
tenminste 20 mug/l Be. Ten gevolge van lineariteitsproblemen in het gebied
tot 50 mug/l Al, is de ICP-MS-techniek minder geschikt voor de bepaling van
Al. De Be en Al bepaling werd uitgevoerd op grond- en drinkwatermonsters
afkomstig van 91 pompstations in Nederland. De concentratie van 10% van de
gefiltreerde ruwe grondwatermonsters en 3% van de reine drinkwatermonsters
lag boven de onderste analysegrens voor Be met een maximum van 900 ng/l Be
(ruw) en 200 ng/l (rein). De concentratie van 20% van de gefiltreerde ruwe
grondwatermonsters en 20% van de reine drinkwatermonsters lag boven de
onderste analysegrens voor Al met een maximum van 985 mug/l Al (ruw) en 205
mug/l Al (rein).
In this study a ICP-MS-method was developed for the determination of Be and Al in ground and drinking-water samples. Detection limits are 50 ng/l Be and 2 mug/l Al if care is taken to avoid Al contamination ; the precision amounts to 2% RSD at elevated concentrations. Spectral interferences due to major components in ground water are negligible. Matrix effects are absent or are reduced to negligible levels after dilution of the samples to less than 5 muM Ba, 10 mM Ca, 1 mM Fe, 5 mM K, 5 mM Mg, 20 mM Na, 2 mM Si or 4 mM SO4. The calibration curve is linear up to at least 20 mug/l Be. Due to linearity problems in the range up to 50 mug/l Al, the ICP-MS technique is less suitable for the determination of Al. The ICP-MS method was applied to the analysis of ground and drinking-water samples from 91 locations in the Netherlands. 10% of the ground water samples and 3% of the drinking-water samples had concentrations above the detection limit for Be with a maximum of 900 ng/l Be in ground water samples and 200 ng/l Be in drinking-water samples. 20% of the groundwater samples and 20% of the drinking-water samples had concentrations above the detection limit for Al with a maximum of 985 mug/l Al in ground water samples and 205 mug/l Al in drinking-water samples.
In this study a ICP-MS-method was developed for the determination of Be and Al in ground and drinking-water samples. Detection limits are 50 ng/l Be and 2 mug/l Al if care is taken to avoid Al contamination ; the precision amounts to 2% RSD at elevated concentrations. Spectral interferences due to major components in ground water are negligible. Matrix effects are absent or are reduced to negligible levels after dilution of the samples to less than 5 muM Ba, 10 mM Ca, 1 mM Fe, 5 mM K, 5 mM Mg, 20 mM Na, 2 mM Si or 4 mM SO4. The calibration curve is linear up to at least 20 mug/l Be. Due to linearity problems in the range up to 50 mug/l Al, the ICP-MS technique is less suitable for the determination of Al. The ICP-MS method was applied to the analysis of ground and drinking-water samples from 91 locations in the Netherlands. 10% of the ground water samples and 3% of the drinking-water samples had concentrations above the detection limit for Be with a maximum of 900 ng/l Be in ground water samples and 200 ng/l Be in drinking-water samples. 20% of the groundwater samples and 20% of the drinking-water samples had concentrations above the detection limit for Al with a maximum of 985 mug/l Al in ground water samples and 205 mug/l Al in drinking-water samples.
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