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Long term stability for refractory elements / nickel uptake

English translation: Long term response stability for nickel compromised by nickel contamination

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:Long term stability for refractory elements / nickel uptake
Selected answer:Long term response stability for nickel compromised by nickel contamination
Entered by: Jörgen Slet

21:40 Nov 3, 2007
English language (monolingual) [PRO]
Science - Chemistry; Chem Sci/Eng / atomic absorption spectrometry, GF-AAS
English term or phrase: Long term stability for refractory elements / nickel uptake
"Long term stability for refractory elements such as nickel can be adversely affected by tube behaviour, i.e. by nickel uptake. Therefore it is advantageous to recalibrate periodically, e.g. every 10 samples."

Can someone explain the process/problem behind this sentence ? I don't really know much about graphite furnace AAS :)

It's from EN 14902 - Ambient air quality - Standard method for the measurement of Pb, Cd, As and Ni in the PM10 fraction of suspended particulate matter
Jörgen Slet
Estonia
Local time: 14:21
explanation
Explanation:
In the long term, the refractory components of the measuring device can get contaminated with the components being measured. e.g. Nickel will migrate into the refractory component. Because of this, they need to be frequently recalibrated.

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Note added at 18 hrs (2007-11-04 16:03:56 GMT)
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Sorry, my 1st explanation was a bit wide of the mark...
Refractory elements are elements that evaporate at high temperatures.

presumably these can be absorbed by the walls of the graphite furnace and alter the calibration.
Selected response from:

JohnGBell
Local time: 14:21
Grading comment
Makes sense, thanks :)
4 KudoZ points were awarded for this answer



SUMMARY OF ALL EXPLANATIONS PROVIDED
4explanation
JohnGBell


Discussion entries: 1





  

Answers


23 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5
long term stability for refractory elements / nickel uptake
explanation


Explanation:
In the long term, the refractory components of the measuring device can get contaminated with the components being measured. e.g. Nickel will migrate into the refractory component. Because of this, they need to be frequently recalibrated.

--------------------------------------------------
Note added at 18 hrs (2007-11-04 16:03:56 GMT)
--------------------------------------------------

Sorry, my 1st explanation was a bit wide of the mark...
Refractory elements are elements that evaporate at high temperatures.

presumably these can be absorbed by the walls of the graphite furnace and alter the calibration.

JohnGBell
Local time: 14:21
Native speaker of: Native in EnglishEnglish
PRO pts in category: 6
Grading comment
Makes sense, thanks :)
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