BS 6068-2.41:1993
Current
The latest, up-to-date edition.
Water quality. Physical, chemical and biochemical methods Determination of fluoride: electrochemical probe method for potable and lightly polluted water
Hardcopy , PDF
English
15-03-1993
Important note : Users cannot be edited or removed once added to your Multi user PDF.Applicable to fluoride concentrations from 0,02 mg/l to 2,0 g/l.
| Committee |
EH/3/2
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| DevelopmentNote |
Also numbered as ISO 10359-1 Supersedes 91/54580 DC (09/2005) Reviewed and confirmed by BSI, July 2008. (06/2008)
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| DocumentType |
Standard
|
| Pages |
14
|
| PublisherName |
British Standards Institution
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| Status |
Current
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| Supersedes |
1.1 Field of application
This part of ISO 10359 specifies a method for the determination of dissolved fluoride in fresh, potable and low contaminated water, and some surface waters, using an electrochemical technique.
The method is directly suitable for measuring fluoride concentrations from 0,2 mg/l to 2,0 g/l. After the addition of a known amount of fluoride, concentrations as low as 0,02 mg/l can be detected (see 7.3).
The method is not suitable for waste waters and industrial effluents; this determination will be the subject of ISO 10359-2.
1.2 Interferences
The electrode will respond directly to hydroxide ions. The formation of HF under acidic conditions will reduce the measured fluoride concentration. Therefore, buffer all test aliquots to a pH between 5 and 7 to prevent such interference. Cations such as calcium, magnesium, iron and aluminium form complexes with fluoride or precipitates to which the electrode does not respond. Therefore the buffer solution also contains trans-1,2-diaminocyclohexane-N,N,Nʹ,Nʹ-tetraacetic acid (CDTA) as a decomplexing agent to free bound fluoride. The boron tetrafluoride anion, BF−4, is not decomplexed by the addition of buffer.
| BS 1427:2009 | Guide to on-site test methods for the analysis of waters |
| ISO 10359-2:1994 | Water quality Determination of fluoride Part 2: Determination of inorganically bound total fluoride after digestion and distillation |
| BS 6068-6.3(1986) : 1986 | WATER QUALITY - SAMPLING - GUIDANCE ON THE PRESERVATION AND HANDLING OF SAMPLES |
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