2010/12: Caloote (South Australia) – Chloral Hydrate, Trihalomethanes

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Caloote (South Australia) – Chloral Hydrate

Caloote Chloral hydrate breaches in SA Water network 2000-2012 (10)

29/7/10 Caloote  Chloral Hydrate 29ug/L

18/11/10 Caloote  Chloral Hydrate 49.9ug/L

16/12/10 Caloote  Chloral Hydrate 21.8ug/L

13/1/11 Caloote  Chloral Hydrate 38.7ug/L

20/10/11 Caloote  Chloral Hydrate 23ug/L

9/2/12 Caloote  Chloral Hydrate 23.5ug/L

8/3/12 Caloote  Chloral Hydrate 33.7ug/L

¾/12 Caloote  Chloral Hydrate 29ug/L

3/5/12 Caloote  Chloral Hydrate 34ug/L

31/5/12 Caloote  Chloral Hydrate 25.3ug/L

Chloral hydrate is a disinfection by-product, arising from chlorination of water containing naturally occurring organic material (NOM). Chloral hydrate is a sedative and hypnotic drug. Long-term use of chloral hydrate is associated with a rapid development of tolerance to its effects and possible addiction as well as adverse effects including rashes, gastric
discomfort and severe renal, cardiac and hepatic failure.

2004 Australian Drinking Water Guideline: Trichloroacetaldehyde (chloral hydrate): 0.02mg/L

2011 Australian Drinking Water Guideline: Trichloroacetaldehyde (chloral hydrate): 0.1mg/L


Caloote (South Australia)

Breaches to Australian Drinking Water Guidelines Levels Only

18/11/2010 Caloote  Murray St Trihalomethanes – Total 286 ug/L

13/01/2011 Caloote Murray St Trihalomethanes – Total 344 ug/L

10/02/2011 Caloote  Murray St Trihalomethanes – Total 381 ug/L

8/03/2011 Caloote Murray St Trihalomethanes – Total 373 ug/L

7/04/2011 Caloote Murray St Trihalomethanes – Total 268 ug/L

3/05/2012 Caloote Murray St Trihalomethanes – Total 279 ug/L


Trihalomethanes Australian Guideline Level 250μg/L (0.25mg/L)

Why and how are THMs formed?
“When chlorine is added to water with organic material, such as algae, river weeds, and decaying leaves, THMs are formed. Residual chlorine molecules react with this harmless organic material to form a group of chlorinated chemical compounds, THMs. They are tasteless and odourless, but harmful and potentially toxic. The quantity of by-products formed is determined by several factors, such as the amount and type of organic material present in water, temperature, pH, chlorine dosage, contact time available for chlorine, and bromide concentration in the water. The organic matter in water mainly consists of a) humic substance, which is the organic portion of soil that remains after prolonged microbial decomposition formed by the decay of leaves, wood, and other vegetable matter; and b) fulvic acid, which is a water soluble substance of low molecular weight that is derived from humus”. Source: http://water.epa.gov/drink/contaminants/index.cfm