Analytical Suite Metadata

Chemex (lake sediments) ISE (F)

Chemex, lake sediments; ion-selective electrode (fluorine)

General Methodology:

Fluorine was determined as described by Ficklin (1970).  A 250 mg sample is sintered with 1 g of a flux consisting of two parts by weight sodium carbonate and one part by weight potassium nitrate.  The residue is then leached with water.  The sodium carbonate is neutralized with 10 ml 10% (w/v) citric acid and the resulting solution is diluted to 100 ml with water.  The pH of the resulting solution should be from 5.5 to 6.5.  The fluoride content of the test solution is then measured using a fluoride ion electrode.  Standard solutions contain sodium carbonate and citric acid in the same quantities as the sample solution.


Ficklin, W. H. (1970).  A rapid method for the determination of fluoride in rocks and soils, using an ion selective electrode.  U.S. Geol Surv Paper 700C p C186-C188.

Instrument: unstated

Sample material: solid

Sample weight: 250 milligrams

Analytical Technique:

Hierarchical classification

Technique >> Electrochemical techniques >> Potentiometry >> Ion-specific electrodes


Glass electrode

Analytical Decomposition:

Hierarchical classification

Decomposition >> Fusion >> Alkaline >> Carbonate >> Na2CO3



Analytical Methods:

IndexMethod OrderMethod IDQuantityDetection Limit
1  1014     F_ISE  40

Associated Analytical Packages:

IndexPackage IDPackage Name
1  147     Chemex (URP lake sediment) AAS (8+Mo), CVAAS (Hg), COL(As), ISE(F), LOI
2  294     Chemex (NGR lake sed 1983 samples) AAS (8+4), CVAAS (Hg), LOI500, U, ISE( F)
3  366     Chemex (URP lake sediment) AAS(8+Mo+As), ISE(F), LOI
4  387     Chemex (NGR lake sediment, 1982 samples) AAS (8+4), CVAAS (Hg), LOI500, U, ISE(F)
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