CHLORINE, NaDCC, 5kg, granules, pot

NST CWATDISING5

Valid Article

Former Code(s): CWATZNL0388 -
Hazardous materials and products (identified by their 4-digit transport UN-number) must be transported under certain conditions as specified in the MSDS sheet (Material Safety Data Sheet).
OC subscriptions: included in supply or field order tools (e.g. UniField)
SC subscriptions: included in supply or field tools
OC validations: approved for procurement and use by an OC for international or local orders specifying context and activity in Medical Standard Lists (MSL)

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CHLORINE, NaDCC, 5kg, granules, pot

Definition

Disinfectant used mainly for treating water but also to prepare chlorine solutions for disinfection of surfaces or instruments.

NaDCC granules exist in 2 different chemical forms: anhydrous and dihydrate.

Synonym

sodium dichloro-s-triazinetrione or sodium troclosene.

Specifications

Granules of NaDCC (only the dehydrate form is supplied to the field).

These are white crystalline granules with a "slight" odour of chlorine. They have the following characteristics:

Dehydrate

CAS number

51580-86-0

Chemical formula

NaC3N3O3Cl2·2H2O

Available chlorine

55.0% - 57.0%

Solubility in water

28 g/100 g

Transport Dangerous Goods

NaDCC, both in dehydrate and in anhydrous form, is regulated for air transport, with conditions:

  • UN 3077 , class 9, code M7, hazard id no.90, packing group III
  • IMO/ICAO/IATA: UN No.3077, class 9, packing group III
  • requires specific packaging and labelling until final destination

Ask for an MSDS (Material Safety Data Sheet) from your supplier; this should contain all necessary information.

Instructions for use

Treatment of water

For chlorinating drinking water, a 1% available chlorine stock solution (or "mother solution") is used (= 10 g available chlorine per litre). It is made with 10 x (100/55) = 18 g NaDCC granules (55% available chlorine) for 1 litre of water. The NaDCC granules are fully effervescent.

The stock solution should be kept in an airtight, opaque, non-metallic container, away from light and heat. It should be replaced every week.

Turbid water should first be brought to a turbidity of < 5 NTU before being treated with chlorine. (In acute emergencies, a turbidity of up to 20 NTU is also acceptable).

To achieve this, turbid water should be filtered, clarified or allowed to settle. In urgent situations, water can be treated with a fix dose of 5 mg/l. In other situations the dose of chlorine added to raw water should be adapted to the chlorine demand to obtain a free residual chlorine level of 0.2-0.5 mg/l for a pH < 8 and 0.5-1 mg/l for pH > 8.

See "Public Health Engineering in Precarious Situations", MSF, 2nd edition, 2010:

  • T.B. 2.19 Chlorine-generating products
  • T.B. 2.21 Batch chlorination of drinking water

Preparation of chlorine solutions

See "Public Health Engineering in Precarious Situations", MSF, 2nd edition, 2010:

Remark

Use a pool-tester to check the presence of free residual chlorine.

See "Public Health Engineering in Precarious Situations", MSF, 2nd edition, 2010:

  • T.B. 2.22 Monitoring chlorination

Precautions for Use

  • NaDCC granules are used mainly to prepare drinking water but can also be used as a disinfectant solution.
  • Prepare solutions in non-metal containers, immediately before use.
  • Avoid inhaling vapour and dust when handling NaDCC.
  • Do not expose to a naked flame, and do not incinerate.
  • Never mix NaDCC granules with calcium hypochlorite powder (HTH®): the mixture undergoes a chemical reaction and may explode!
  • Do not mix with detergents since toxic chlorine gas could be released.
  • Do not mix with acid solutions since this releases toxic chlorine gas.
  • Do not mix or store NaDCC with fuel.

Storage

Store in a dry and well-ventilated place. Ensure containers are properly resealed after use.

Stores well (at least 2 years) in good storage conditions.

Waste management

Contact your WHS technical referent for disposal of expired or damaged batches of NaDCC.

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Image Image
H302Harmful if swallowed
H319Causes serious eye irritation
H335May cause respiratory irritation
H410Very toxic to aquatic life with long lasting effects
EUH031Contact with acids liberates toxic gas.
P402 + P404Store in a dry place. Store in a closed container.
P233Keep container tightly closed.
P271Use only outdoors or in a well-ventilated area.
P280Wear protective gloves/protective clothing/eye protection/face protection
P301 + P310IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P501Dispose of contents/container to location in accordance with local and regional/ national/ international regulations
P305 + P351 + P313IF IN EYES: rinse continuously with water for several minutes. Get medical advice/attention