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Boric acid, 500 g

≥99,8 %, p.a., ACS, ISO
Icon_EVE-EUD Please consider that this product might be liable to some legal sanctions as for example to obtain an end user declaration or the prohibition of some applications. For details please do contact your counterpart in our sales department!
Examples of effect: Have an allergenic effect, carcinogenic, mutagenic, toxic to reproduction and cause developmental toxicity (reprotoxic) or damage to organs Safety: You must be well-informed before starting work with these substances; wear protective clothing and gloves, eye protection and mask or breathing protection.
Danger
H360FD
i may damage fertility. May damage the unborn child
P201 P280 P308+P313
i obtain special instructions before use, wear protective gloves/protective clothing/eye protection/face protection, IF exposed or concerned: Get medical advice/attention
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Empirical formula H3BO3
Molar mass (M) 61,83 g/mol
Density (D) 1,489 g/cm³
Melting point (mp) >100 °C
WGK 1
CAS No. [10043-35-3]
EG-Nr. 233-139-2

Buffer substance, for molecular biology

Guarantee analysis

CHF34.90/Pack Qty. 

excl. VAT. | 500 g per Pack Qty.

Art. No. 6943.4

Available at short notice
Free of shipping costs from 200 CHF
from 6 Pack Qty. CHF33.16/Pack Qty.
from 24 Pack Qty. CHF31.41/Pack Qty.
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Boric acid
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6943.1 1 kg plastic CHF49.70
6943.2 250 g plastic CHF27.30
6943.3 5 kg plastic CHF199.50
6943.4 500 g plastic CHF34.90
6943.5 25 kg plastic CHF908.60
6943.6 2.5 kg plastic CHF103.50
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General information

Determination of Nitrogen according to Kjeldahl

Determination of Nitrogen according to KjeldahlThe 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.


Analysis of Food

Analysis of FoodCarl 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

as well as other determining factors such as
• Viscosity
• Density
• Hydroxyl value
• Fluoride ions


Certificates of Analysis

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.)≥99,8 %  
In CH3OH insoluble matter≤0,005 %  
Chloride (Cl)≤0,0005 %  
Sulphate (SO4)≤0,002 %  
Phosphate (PO4)≤0,0005 %  
Heavy metals (as Pb)≤0,0005 %  
Arsenic (As)≤0,00005 %  
Calcium (Ca)≤0,002 %  
Cadmium (Cd)≤0,0005 %  
Copper (Cu)≤0,0005 %  
Iron (Fe)≤0,0001 %  
Magnesium (Mg)≤0,0005 %  
Lead (Pb)≤0,0005 %  
Zinc (Zn)≤0,0005 %  
With CH3OH+HCl non volatile matter (as SO4)≤0,05 %  

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