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Chlorine testing of drinking water

Safety and palatability of drinking water supplies is of primary importance in Maritime and other industry sectors. Argentic’s new self- test kits allow operators and inspectors to test and confirm that water chlorination is to the appropriate recommended concentration.

‘Shore mains water often contains only a very low concentration of free chlorine and the ship environment decreases this further. In some countries there may be no free chlorine content at all. It is therefore recommended that all freshwater taken from shore or water barge should be chlorinated on loading to a sufficient concentration to ensure a residual free chlorine content of 0.2 ppm) The concentration may be checked by means of a commercial comparator kit. A regular routine for the chlorination of freshwater tanks to maintain 0.2 ppm concentration should be established.'( UK MCA Marine Guidance Note MGN 397).

In order to ensure these concentrations are achieved and maintained the following actions are recommended –

A 2005 collaborative study by the Association Of Port Health Authorities (APHA) and the Health Protection Agency (HPA) found 49% of the 950 potable water samples taken contained less than the regulatory minimum chlorine concentration (0.2 mg/l). Regular testing and correct chlorination of potable water tanks and outlets for chlorine will prevent growth of bacteria such as coliforms and e.coli, reducing risks and helping ensure employee health.

Chlorine test kit

Easy-to-use chlorine test kits from Argentic offer an ideal means of testing water at sea or at berth, and are available in two formats :

  1. A colour comparison kit, using cost-effective chlorine reaction tablets to indicate a wide range of concentrations, from 0.1 to 8.0 ppm. This highly portable and compact kit is suitable for use during inspection and audit in order to give a rapid indication of the chlorine level in water supplies
  2. A compact and robust ‘instrument free’ system that uses renowned comparator technology to deliver highly accurate test results at levels between 0.1 and 2.0 ppm. This Argentic comparator kit should be used to check accurately the chlorine levels in supplied drinking water. Regular testing as outlined in the regulations will help ensure water safety and demonstrate that water chlorine levels are in compliance with regulatory standards. In addition the results can be used to show that crew welfare is being protected, as required by the new MLC code.