Territory Stories

Alligator Rivers region regional surface water quality monitoring : November 1978 - April 1981



Alligator Rivers region regional surface water quality monitoring : November 1978 - April 1981

Other title

Alligator Rivers Region - Regional Surface Water Quality Monitoring, Volumes 1,2,3 (Plus draft)


Northern Territory. Department of Transport and Works. Water Division, Environmental Section


E-Publications; E-Books; PublicationNT; Report ; 49/1983




At head of title: Water Division, Dept. of Transport &​ Works, Northern Territory. "April 1983".




Water quality -- Northern Territory -- Alligator Rivers Region; Hydrology -- Northern Territory -- Alligator Rivers Region

Publisher name

Northern Territory Government

Place of publication



Report ; 49/1983


3 volumes. ; 30 cm

File type



Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government



Related links

https://hdl.handle.net/10070/672725 [Alligator Rivers region regional surface water quality monitoring : November 1978 - April 1981 - WRD83049_v_1.pdf]; https://hdl.handle.net/10070/672727 [Alligator Rivers region regional surface water quality monitoring : November 1978 - April 1981 - WRD83049_v_2.pdf]; https://hdl.handle.net/10070/672729 [Alligator Rivers region regional surface water quality monitoring : November 1978 - April 1981 - WRD83049_v_3.pdf]

Parent handle


Citation address


Related items

https://hdl.handle.net/10070/672729; https://hdl.handle.net/10070/672727

Page content

Technical Report WRD83049 Viewed at 14:07:10 on 29/07/2010 Page 30 of 440. Organic carbon ~!ETALS Copper Lead Zinc Cadmium Maganese Iron Radium Uranium 2 9. This is an expression of the content of organic material in the water, dissolved being that in solution, and total, including that in particulate form. It may be important when considering eutrophication of water bodies. For storage glass bottles are recommended, and storage on ice is also recowmended. These are all toxic metals corrmonly occurring a.'ld often associated 1vi th sulphide ores (as are the uranilli~ ore bodies). The concentration of all has been shown to be extremely low in initial monitoring (with the exception of manganese in some cases). Constant problems are found with contamination during collection, pretreatment and analysis, especially prevalent with zinc. Sewage and wastewater discharge could also be a source of these elements, so careful monitoring is required. As these metals may be associated with particulate matter, the concentration of these metals in the water for that portion (residue) is analysed as well as that in solution, and both may be combined to give a total content. Sampling must be followed by irn.rnediate filtration and acidification of the filtrate as the form of metals may change on sta.'lding. This process (filtration) is the one most likely to cause con ta.'llination. Although this is of low toxicitv, this is normally associated mainly with suspended material and may jeopardize aesthetic quality of the water. As with other metals, analyses are carried out on both filtrate and residue. The problem of changing phase on storage still exists as with other metals, but little contamination is evident. This is a very important element, as it is used as the indicator of radioactive contamination. It may appear in both filtrate and I I I I I I I I I I I I I I residue, with a majority expected in the residue., Its sampling and preservation is not overly crucial except problems of cha.'lging phases, and contamination is rarely a problem. It is hmvever a very difficult and expensive analysis. I Although this is of low toxicity and very unlikely to be released into the system it is I in the public eye. It is important in detecting accidental releases, as normal uranium concentration is very low and contamination unlikelv. As with iron the majority is I associated with suspended materials. I I

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