Chemistry Reference
In-Depth Information
2.5.6
Preconcentration
The preconcentration of arsenite is discused in section 15.1.1.
2.6
Ascorbate
2.6.1
Spectrophotometric method
Norwitz and Keliher [17] have discussed the determination of ascorbic and isoascorbic
acids by the Spectrophotometric diazotisation coupling technique.
2.6.2
Spectrofluorometric method
Ascorbate at the nmol
−1
level has been determined by a kinetic fluorometric method [18].
2.6.3
High performance liquid chromatography
Kishida
et al.
[19] derivatised ascorbic acid with 2.4-dinitrophenyl hydrazine to ascorbic
acid bis (dinitrophenyl) hydrazone (osazone) prior to separation from other sample
constituents by high performance liquid chromatography.
2.7
Benzoate
2.7.7
Ion chromatography
The application of this technique is discussed under multianion analysis in section 12.2.5.
2.8
Bicarbonate
2.8.1
Titration method
Feij and Smeenk [20] and Colin [21] discuss the titrimetric determination of bicarbonate.
2.8.2
Segmented flow analysis
This technique can be applied to the determination of bicarbonate in the concentration
range 0-0.5mg L
−1
as (CO
2
) in water.
2.8.3
Flow injection analysis
Basson and Van Staden [22] have described a single point titration system for the
determination of total alkalinity in surface waters, ground and domestic waters, based on
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