Auxiliary Reagents for AAS (Atomic Absorption Spectroscopy)
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 | | 55459 | Hydroxylamine hydrochloride | 5470-11-1 | Puriss. P.a., Hg< 1ppb, As < 1ppb, Sb < 1 ppb, Se < 1 ppb | 50g, 250g | | 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 |
- W. Schuhknecht, H. Schinkel, Fresenius Z.Anal.Chem. 194 (1963) 161
- 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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