2016/17 – Melrose (South Australia) – Chloride, Sodium

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Melrose (South Australia) – Chloride

August 16 2016 Melrose (South Australia)  Chloride 547mg/L

November 7 2016 Melrose (South Australia)  Chloride 527mg/L

February 27 2017 Melrose (South Australia)  Chloride 543mg/L

May 22 2017 Melrose (South Australia)  Chloride 567mg/L

“Chloride is present in natural waters from the dissolution of salt deposits, and contamination from effluent disposal. Sodium chloride is widely used in the production of industrial chemicals such as caustic soda, chlorine, and sodium chlorite and hypochlorite. Potassium chloride is used in the production of fertilisers.

The taste threshold of chloride in water is dependent on the associated cation but is in the range 200–300 mg/L. The chloride content of water can affect corrosion of pipes and fittings. It can also affect the solubility of metal ions.

In surface water, the concentration of chloride is usually less than 100 mg/L and frequently below 10 mg/L. Groundwater can have higher concentrations, particularly if there is salt water intrusion.

Based on aesthetic considerations, the chloride concentration in drinking water should not exceed 250 mg/L.

No health-based guideline value is proposed for chloride.” 2011 Australian Drinking Water Guidelines

Melrose (South Australia) – Sodium

16/8/16 Melrose  Sodium 411mg/L

7/11/16 Melrose Sodium 388mg/L

27/2/17 Melrose Sodium 408mg/L

22/5/17 Melrose Sodium 393mg/L

“Based on aesthetic considerations (taste), the concentration of sodium in drinking water
should not exceed 180 mg/L….The sodium ion is widespread in water due to the high solubility of sodium salts and the abundance of mineral deposits. Near coastal areas, windborne sea spray can make an important contribution either by fallout onto land surfaces where it can drain to drinking water sources, or from washout by rain. Apart from saline intrusion and natural contamination, water treatment chemicals, domestic water softeners and
sewage effluent can contribute to the sodium content of drinking water.” ADWG 2011