Magnesium sulphate, 1 kg
Molar mass (M) 120,37 g/mol
Density (D) 2,66 g/cm³
CAS No. [7487-88-9]
excl. VAT. | 1 kg per Pack Qty.
Art. No. 0682.3
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Magnesium sulphate ≥99 %, p.a., anhydrous
|Suitable (as desiccant) for||Almost all compounds including acids, acid derivatives, aldehydes, esters, nitriles and ketones|
|Regeneration||First 200 °C, then red heat|
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Our salts for analysis are manufactured under strict production guidelines. Analytical purity and best quality reliably characterize each batch. Salts in p.a. quality made by Carl ROTH meet the high requirements for reproducible results. Most of our salts are additionally specified according to international standards like ACS and ISO.
Definition:p.a.: pro analysi (for analysis)ACS: American Chemical SocietyISO: International Standard Organisation
For pesticide residue analysis in food
Within a few years after its development the QuEChERS method (Quick, Easy, Cheap, Efficient, Rugged, Safe) has gained a leading position for determination of pesticide residues in food samples by GC-MS or LC-MS, allowing rapid and cheap clean-up of strongly matrix-contaminated samples. For optimizing the extraction of pH-dependent compounds, for minimizing decomposition of sensitive substances, and for broadening the matrix spectrum,different modifications of the QuEChERS method have been elaborated.
In addition to the required adsorbent Silica gel 60 diamino a number of individually weighed and premixed buffer and extraction mixtures is offered, specially composed for different sample matrices.
For extraction, the European standard EN 15662 recommends a citrate extraction mix (Mix I), while AOAC standard 2007.1 uses an acetate extraction mix (Mix II). For clean-up, the Diamino phase (PSA) removes, e.g., sugars and organic acids. Magnesium sulfate removes water, C18 ec removes non-polar interferences such as fats and the carbon phase removes pigments, sterols, and non-polar interferences. For selection of the proper clean-up mix see table below.
Further attractive products to complete your chromatography laboratory can be found on our Chromatography page!
Desiccants can absorb water and bind it chemically (reversibly or irreversibly) or physically. The main desiccants can be subdivided into four categories:
- non-renewable chemical desiccants
- renewable chemical desiccants
- silica gels
- molecular sieves
|Acetic acid anhydride||-||-||+||-|
|Acetic acid ethyl ester||4 Å||+||-||+|
|Acetic acid methyl ester||4 Å||+||-||+|
|Diisopropyl ether||4 Å||-||+||-|
|Dimethyl formamide||4 Å||-||-||-|
|Xylene (Isomer compound)||4 Å||-||+||-|
|Appearance||white to off-white powder|
|Assay (dry substance)||≥99.0 %|
|Chloride (Cl)||≤0.05 %|
|Arsenic (As)||≤0.001 %|
|Iron (Fe)||≤0.002 %|
|Heavy metals (as Pb)||≤0.001 %|