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News from the Lab  Articles Online  Analytical Quick Tip  IV Line Humor  Selecting a Sample Preparation Method

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To help in making a determination of an ICP's performance characteristics, consider having all of the data available on a desktop computer. This provides convenience and allows the analyst to construct potential spectra by calling up the element and the anticipated concentration for each element in the analytical sample. Having several lines available makes the job of line selection easy as well as the estimation of the line's sensitivity and linearity. Constructing these composite spectra from pure single element solutions eliminates confusion as to the identity of the line.

The selection of a preparation method is dependent upon:

1. the analyte(s)
2. the analyte concentration level(s)
3. the sample matrix
4. the instrumental measurement technique
5. the required sample size

The method selected will require specific sample preparation equipment and reagents. Contamination from the atmosphere, apparatus, and reagents is a key issue when addressing the selection process.

The following checklist should be considered prior to selecting a method:

• The identity of the analytes and potential chemical forms.



• The concentration range(s) of the analyte(s) and the detection limit requirement(s).



• The chemical and physical composition of the sample matrix.



• The availability of apparatus and equipment.



• The sample size that is available or required.



• The potential for contamination during some part of the sample preparation process.

Using the above information, the analyst is in a position to select the preparation technique. This involves choosing the mode of attack (acid digestion, ashing, fusion), the specific chemical reagents, and the container(s) materials needed to carry out the preparation. The analyst must keep in mind that contamination issues, plus any difficulties within the final sample solution matrix, will have an impact upon the ICP-OES and/or ICP-MS measurement techniques.

Articles Online  more articles »

Sample Preparation Guide: Scandium  · NEW ·
This, the seventh installment of our Sample Preparation Guide, features detailed preparation tips for samples containing scandium (Sc).

Dissolving Graphite to Measure by ICP  · NEW ·
Dr. Gaines recommends a sample preparation method for dissolving graphite powder to measure elements using ICP.

ICP Operations Guide  · COMPLETE ·
A clear 16-part online guide intended for anyone preparing samples and standards for measurement using ICP. Topics cover many day-to-day tasks required by all operators.

Reliable Measurements: A Guidebook for Trace Analysts  · COMPLETE ·
An essential 17-part online guide for chemical analysts. Topics cover all phases of sample collection, preparation, measurement, and data analysis.

IV Line Humor  more humor »

Q: What do you call a tooth in a glass of water?
A: One molar solution.