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Ammonium sulphate, 5 kg

≥99,5 %, p.a., ACS, ISO
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Pack Qty.
Pack.
di-Ammoniumsulphate
Empirical formula (NH4)2SO4
Molar mass (M) 132,14 g/mol
Density (D) 1,77 g/cm³
Melting point (mp) 230 °C
WGK 1
CAS No. [7783-20-2]
EG-Nr. 231-984-1

Reagent for precipitation of proteins, buffer substance, preparation of ammonium alum.

Guarantee analysis
€95.60 /Pack Qty.

€66.85/Pack Qty.  Campaign price!

excl. VAT. | 5 kg per Pack Qty.

Art. No. 3746.4

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Ammonium sulphate
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Order No. Pack Qty. Pack. Price Quantity
3746.1 1 kg plastic €20.95
3746.2 250 g plastic €9.40
3746.3 2.5 kg plastic €38.00
3746.4 5 kg plastic €66.85
3746.5 25 kg plastic €232.50
3746.6 10 kg plastic €107.35
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General information

Analysis of Food

Carl ROTH also offers reagents suitable for food analysis.

On the following pages, you will find the determination of
• Nitrogen according to Kjeldahl
• Sugar
• Mercury
• Trichinae
• Fat

and the determination of the
• Iodine value
• Acid value
• Peroxide value
• Saponification value

Determination of nitrogen according to Kjeldahl

The most common technique for measuring the amount of nitrogen in organic matter is the Kjeldahl method, which is used in a wide range of sectors such as environmental analysis, food analysis, water analysis and agricultural analysis, as well as in the pharmaceutical and chemical industries. In this traditional method, a precisely weighed sample is broken down using concentrated sulphuric acid, a process which digests its organic contents and reacts nitrogen to form ammonium sulphate.(CHNO)(s) → CO2 (g) + SO2 (g) + H2O (g) + NH4SO4 (solv, H2SO4)A catalyst or catalyst mixture consisting of copper, selenium, mercury and/or titanium is added to speed up the reaction. Sodium or potassium sulphate is used to give the sulphuric acid a higher boiling point. If the nitrogen is contained in a nitro, nitroso or azo compound, however, the mixture must be reduced with zinc before digestion takes place.
The nitrogen is now present in the sulphuric acid as ammonium sulphate. Adding a strong base (such as NaOH) neutralises the sulphuric acid and liberates ammonia from the solution.NH4SO4 (solv) + 2 NaOH (aq) → Na2SO4 (aq) + 2 NH3 (g) + 2 H2O (l) The ammonia is led into an acid (such as boric acid) by means of steam distillation.B(OH)3 (aq) + 2 H2O (l) + NH3 (g) → B(OH)4 (aq) + NH4+ (aq) The resulting strong base (borate ion) is back-titrated with a strong acid (hydrochloric acid or sulphuric acid). The excess weak boric acid is not captured in the process. A Tashiro's indicator that changes colour in the acid is used for titration. The amount of acid that has been used up can then be converted into the amount of nitrogen in the sample. NH4+ (aq) + B(OH)4 (aq) + HCl (l) → NH4Cl (aq) + B(OH)3 (aq) + H2O (l)To calculate the protein content of the sample, the varying nitrogen content of the amino acids must be checked and the relevant conversion factors applied. The nitrogen contained in food derives mainly from proteins, but different samples may also contain other sources of nitrogen.

Salts for Analysis

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 Society

ISO: International Standard Organisation

Analysis certificates

You can search for and download your certificate of analysis for the selected product here. Please provide your batch number.
The following analysis certificates have been found:

Guarantee analysis

Assay (acidim.)≥99,5 %
pH value (5 % in H2O)5,0-6,0
In H2O insoluble matter≤0,005 %
Ash content (as SO4)≤0,005 %
Phosphate (PO4)≤0,0005 %
Nitrate (NO3)≤0,001 %
Chloride (Cl)≤0,0003 %
Arsenic (As)≤0,00002 %
Lead (Pb)≤0,0002 %
Cadmium (Cd)≤0,0001 %
Calcium (Ca)≤0,001 %
Iron (Fe)≤0,0002 %
Cobalt (Co)≤0,0005 %
Magnesium (Mg)≤0,0005 %
Sodium (Na)≤0,005 %
Nickel (Ni)≤0,0005 %
Heavy metals (as Pb)≤0,0005 %
Zinc (Zn)≤0,0001 %
Loss on drying (100 °C)≤0,1 %

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