CHLORINE, 10mg, NaDCC 17mg, for disinfection 5l water, tab
Valid Article
CHLORINE, NaDCC, tablet
Definition
Disinfectant used for treating small quantities of water with a turbidity of < 5 NTU.
NaDCC exists in 2 different chemical forms: anhydrous and dihydrate.
Specifications
- CWATDISINTF: effervescent tablet containing 8.5 mg NaDCC (either anhydrous or dihydrate). One tablet releases 5 mg of available chlorine when it is dissolved in 1 litre of water.
- CWATDISINTT: effervescent tablet containing 17 mg NaDCC (either anhydrous or dihydrate). One tablet releases 10 mg of available chlorine when it is dissolved in 5 litres of water.
The tablets have the following properties depending on their form:
Anhydrous | Dihydrate | |
CAS number | 2893-78-9 | 51580-86-0 |
Chemical formula | NaC3N3O3Cl2 | NaC3N3O3Cl2·2H2O |
Available chlorine | > 62.0% | 55.0% - 57.0% |
Solubility in water | 24 g/100 g | 28 g/100 g |
Packaging & Labelling
Blisters
Transport Dangerous Goods
NaDCC, both in dihydrate and in anhydrous form, is regulated for air transport, with the following conditions:
- UN 3077
- 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
Strength of solutions is expressed in terms of available chlorine content (either in g or mg per litre, in parts per million (ppm), or as a percentage).
=> 5 mg/litre = 5 ppm = 0.0005%
This strength is intended only for disinfecting small quantities of drinking water.
Dissolve:
- One 5 mg tablet in 1 litre of clean water. Allow to react for at least 30 minutes before drinking.
- One 10 mg tablet in 5 litre of clean water. Allow to react for at least 30 minutes before drinking.
The above dosing is recommended by the manufacturer. Actual chlorine demand might differ from water to water, especially when chlorinating surface water. It is highly recommended to carry out a jar test to define appropriate dosing.
Turbid water should first be brought to a turbidity of <5 NTU before being treated with chlorine. To reduce turbidity, turbid water should be filtered, clarified or allowed to settle.
For large-scale water treatment, use the 1 g tablets (see "Related Articles" below) or NaDCC or calcium hypochlorite granules (HTH).
See "Public Health Engineering in Precarious Situations", MSF, 2nd edition 2010:
- T.B. 2.19 Chlorine-generating products
- T.B. 2.20 Preparation and use of chlorine solutions for disinfection
- T.B. 2.21 Batch chlorination of drinking water
Remark
Use a pool-tester to check the presence of residual chlorine. See "Public Health Engineering in Precarious Situations", MSF, 2nd edition, 2010:
- T.B. 2.22 Monitoring chlorination
Precautions for Use
- NaDCC in blister tablets is used only to prepare drinking water and not as a disinfectant. Larger tablets from 1 gram could be used as disinfectant.
- Prepare solutions in non-metal containers, immediately before use.
- Avoid inhaling vapour and dust when handling chlorine.
- Do not expose to a naked flame, and do not incinerate.
- Never mix NaDCC solution with calcium hypochlorite powder: 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, out of direct sun light.
Do not store in the same place as fuel and other petroleum products.
Shelf-life in good storage conditions: 5 years for blister packs.
Waste management
Contact your WHS technical referent for disposal of expired or damaged batches of NaDCC.
H302 | Harmful if swallowed |
H319 | Causes serious eye irritation |
H335 | May cause respiratory irritation |
H410 | Very toxic to aquatic life with long lasting effects |
EUH031 | Contact with acids liberates toxic gas. |
P402 + P404 | Store in a dry place. Store in a closed container. |
P233 | Keep container tightly closed. |
P280 | Wear protective gloves/protective clothing/eye protection/face protection |
P301 + P310 | IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. |
P501 | Dispose of contents/container to location in accordance with local and regional/ national/ international regulations |
P305 + P351 + P313 | IF IN EYES: rinse continuously with water for several minutes. Get medical advice/attention |