Javel water

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safety instructions
Surname
  • Javel water
  • Eau de Javel
  • Eau de Labarraque
  • Sodium hypochlorite solution
  • Potassium hypochlorite solution
CAS number
  • 7681-52-9 (sodium hypochlorite)
  • 7778-66-7 (potassium hypochlorite)
EC number

231-668-3

ECHA InfoCard

100,028,790

GHS labeling of hazardous substances
05 - Corrosive 09 - Dangerous for the environment

danger

H and P phrases H: 314-400
EUH: 031
P: 260-280-303 + 361 + 353-304 + 340 + 310-305 + 351 + 338

Eau de Javel (also Javel water or Javelle water ) is an aqueous solution of potassium hypochlorite (KClO), in a mixture with potassium chloride (KCl). Eau de Javel got its name after its first place of manufacture, the French town of Javel (formerly Javelle , now part of Paris), where it has been commercially produced as a bleaching agent since 1792 . The village of Javelle continued to write itself into the 20th century , which is why the chemical is still called Eau de Javelle in older chemistry books .

In the trade, solutions with sodium hypochlorite instead of potassium hypochlorite are also offered under the name Javelwasser , then in a mixture with sodium chloride . The name Eau de Labarraque is also used for this.

The aqueous solution is yellow and has a pungent odor.

use

Eau de Javel with sodium hypochlorite

The use as a bleaching agent in the textile industry goes back to Claude-Louis Berthollet , who also discovered the decolorizing effect. It is recommended for removing mold stains . Due to its antimicrobiotic (bactericidal) effect, Eau de Javel is also used for disinfection ; this is how it treats water in swimming pools and replaces the dangerous chlorine gas . Eau de Javel is also used to oxidize cyanide-containing solutions.

Javel water is used as a 0.1 to 0.5 percent ready-to-use solution when dealing with microorganisms for decontamination. Decontamination is effective for viruses, bacteria and fungi (only to a limited extent for spores). Javel water is not used for skin disinfection.

The use of Javel water for disinfecting cork for closing wine bottles is problematic because arising 2,4,6-trichlorophenol of microorganisms in 2,4,6-trichloroanisole can be converted. The smell of 2,4,6-trichloroanisole is perceived as unpleasant by the wine drinker, the wine then smells of cork . 2,4,6-trichloroanisole is already perceptible at concentrations of 30 µg / l.

Hypochlorite-based bleaching agents must not be mixed with acids or acidic cleaning agents, otherwise the toxic chlorine gas is produced.

Individual evidence

  1. a b c Entry on sodium hypochlorite, aqueous solution with proportions of active chlorine in the GESTIS substance database of the IFA , accessed on January 29, 2017(JavaScript required) .
  2. ^ Brockhaus ABC chemistry. Volume 1: A - K. VEB FA Brockhaus, Leipzig 1965, p. 569.
  3. Albert Gossauer: Structure and reactivity of biomolecules. An introduction to organic chemistry. Verlag Helvetica Chimica Acta et al., Zurich 2006, ISBN 3-906390-29-2 , p. 186.