Trace Analysis

Trace Analysis - AAS Auxiliary Reagents

Reduction Reagents for Hydride-AAS

The method of hydride atomic absorption spectrometry is used for the analysis (especially traces) of arsenic, antimony, tin, selenium, bismuth and mercury. It is used to separate and preconcentrate analytes from sample matrices by a reaction that turns them into their hydride vapors. Sodium borohydride is the common reagent of choice for the reduction.

The Fluka reagents are specially analyzed for the absence of hydride generating metals (see Table 1).

Table 1. Reduction reagents for Hydride-AAS

Catalog No.
Product Name
CAS No.
Quality
Package Size
11514
Hydroxylamine hydrochloride
5470-11-1
≥ 99.9995%, Hg 10 ppb, As 5 ppb, Sb 10 ppb, Se 10 ppb
100g
71321
Sodium borohydride
16940-66-2
Puriss. P.a., Hg 5 ppb, As 5 ppb, Sb 5 ppb, Se 5 ppb
25g, 100g
96527
Stannous chloride Dihydrate
10025-69-1
Puriss. P.a., Hg 1 ppb
50g, 250g


Table 2. Auxiliary Reagents for AAS

Catalog No.
Product Name
CAS No.
Description
Package Size
09927
Quartz
14808-60-7
Puriss. P.a., polishing material for cone; powder > 230 mesh
10 g


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Spectroscopic Buffers for Flame-AAS

For the suppression of physical, ionic and chemical interferences Schuhknecht and Schinkel described spectroscopic buffer solutions by using flame atomic absorption spectroscopy. The solution of Schuhknecht and Schinkel should be used when determining alkali metals (1), Schinkel’s solution represents a method enlargement of up to 14 elements (Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Na, Ni, Sr, Zn) (2). Take a look at Table 3 of what Fluka can offer you!

Table 3. Auxiliary Reagents for AAS

Catalog No.
Product Name
pH
Description
Package Size
20980
Cesium chloride – Aluminum nitrate buffer solution (Schuhknecht and Schinkel)
2.0
50 g/l CsCl
250 g/l Al(NO3)39H2O
50 ml
20982
Cesium chloride – Lanthanum chloride buffer solution (Schinkel)
2.0
10 g/l La; 10 g/l CsCl
50 ml


  1. W. Schuhknecht, H. Schinkel, Fresenius Z.Anal.Chem. 194 (1963) 161
  2. H. Schinkel, Fresenius Z.Anal. Chem. 317 (1984) 10


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Matrix Modifier for Graphite Furnace AAS

The use of chemical modification shoud be considered if an analyte is highly volatile or if analyte and matrix volatilize at similar temperatures. The modification will allow ashing at higher (or atomization at lower) furnace temperatures, getting rid of the matrix without loosing a relatively volatile analyte (or atomizing the analyte without the matrix). Several compounds are known in the literature for this application, the most common ones are magnesium and palladium solutions.

Table 4. Matrix Modifier for Graphite Furnace AAS

Catalog No.
Product Name
Cas No.
Description
Package Size
04052
Lanthanum oxide
1312-81-8
-
50 g, 250 g
63043
Magnesium Modifier
13446-18-9
10g/l Mg (as Mg(NO3)2 in HNO3)
50 ml
76040
Palladium Modifier
10102-05-3
10 g/l Pd (as Pd(NO3)2 in HNO3)
50 ml


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