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However, bleach is a disinfectant and not a cleaner. Bleach does a fantastic job of killing germs. It removes tough stains. But bleach doesn't really clean dirt and residue from surfaces. To do that, you'd need to scrub and rinse surfaces.
For many household cleaning jobs, bleach just isn't the right cleaning solution. It has heavy fumes that can make you sick. Contact with bleach on your skin is irritating and can be very harmful. Mixing it with many other cleaners can give you toxic results. Bleach can also damage surfaces and remove colour.
The active ingredient in most chlorine bleaches is sodium hypochlorite, NaOCl. In bleaching powders, or in swimming-pool "chlorine", hypochlorite ion may be present as calcium hypochlorite, Ca(ClO)2.
The oxidizing action of the hypochlorite ion, kills germs and also decolourises many stains and dyes. The quantity of hypochlorite ion in a sample of bleach can be determined by finding out how much iodine, I2, it can produce by oxidizing the iodide ion, I. The quantity of iodine produced is measured by titrating it with sodium thiosulphate, Na2S2O3.
This method can be automated using the Metrohm 848 titrino plus.
Fast, accurate results are obtained, with minimum operator intervention.
For more information on methods and instrumentation please email Metrohm at enquiry@metrohm.co.uk or telephone 01280 824824.
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