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Tashiro’s indicator solution

in ethanol, denatured
Mogelijke gevolgen: zijn ontvlambaar; vloeistoffen vormen met lucht explosieve mengsels; zorgen met water voor ontvlambare gassen of zijn zelfontvlambaar. Veiligheid: uit de buurt van open vuur en warmtebronnen houden; vaten dicht afsluiten; brandveilig bewaren.
Warning
H226
i flammable liquid and vapour
P210 P280 P303+P361+P353 P305+P351+P338
i keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking, wear protective gloves/eye protection/face protection, IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water [or shower], IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing
VE
Verp.
Density (D) 0,934 g/cm³
Flash point (flp) 27 °C
ADR 3 III
WGK 1
UN-Nr. 1170

pH indicator, mixed indicator

24,20 €/VE 

Excl. btw | 250 ml Per VE

Bestelnr. 2624.1

Op voorraad
Vrij van verzendingskosten vanaf 250 €
Snelle en betrouwbare levering!
Vanaf 6 VE 22,99 €/VE
Vanaf 24 VE 21,78 €/VE

Productdetails



Tashiro’s indicator solution in ethanol, denatured

Technische informatie
Kleuromslag violet - green 
Omslagbereik pH 4,2 - 6,2 
Tashiro’s indicator solution
Geselecteerde hoeveelheid:   0
  1. Tussentotaal:  0.00
Bestelnr. VE Verp. Prijs Hoeveelheid
2624.1 250 ml plastic

24,20 €

Op voorraad
Beschikbaar
In bestelling
Niet meer verkrijgbaar
Leveringsdatum onbekend
Geselecteerde hoeveelheid:   0
  1. Tussentotaal:  0.00

Downloads / MSDS


Algemene informatie

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.


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Analysecertificaten

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