Sodium thiosulphate pentahydrate, 25 kg
Molar mass (M) 248,18 g/mol
Density (D) 1,73 g/cm³
Melting point (mp) 48 °C
CAS No. [10102-17-7]
excl. VAT. | 25 kg per Pack Qty.
Art. No. P034.5
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Determination of biological oxygen demand (BOD)
BOD (biochemical oxygen demand) is a measure of the amount of oxygen that microorganisms need to break down the organic material in a water sample over a specific period of time. It is important to calculate the oxygen concentration at the start and end of the measuring time, which is usually five days and is expressed as an index (BOD5). Chemical, electrochemical or physical methods are used for this calculation.
Indicators and Dyes
Carl ROTH offers many indicators and dyes of high purity, which can be used in special applications.
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
|Assay (iodom.)||99,5-101,0 %|
|pH value (5 % in water)||6,0-8,4|
|In H2O insoluble matter||≤0,005 %|
|Total nitrogen (as N)||≤0,002 %|
|Chloride (Cl)||≤0,02 %|
|Sulphate and sulphite (as SO4)||≤0,1 %|
|Sulphide (S)||≤0,0001 %|
|Heavy metals (as Pb)||≤0,0005 %|
|Calcium (Ca)||≤0,002 %|
|Cobalt (Co)||≤0,0005 %|
|Chromium (Cr)||≤0,0005 %|
|Magnesium (Mg)||≤0,001 %|
|Nickel (Ni)||≤0,0005 %|
|Potassium (K)||≤0,005 %|
|Cadmium (Cd)||≤0,0005 %|
|Copper (Cu)||≤0,0005 %|
|Iron (Fe)||≤0,0005 %|
|Manganese (Mn)||≤0,0005 %|
|Lead (Pb)||≤0,0005 %|
|Zinc (Zn)||≤0,0005 %|