Territory Stories

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

Details:

Title

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)

Creator

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

Collection

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

Date

1983-04-01

Notes

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

Language

English

Subject

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

Publisher name

Northern Territory Government

Place of publication

Darwin

Series

Report ; 49/1983

Format

3 volumes. ; 30 cm

File type

application/pdf

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0

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

https://hdl.handle.net/10070/229664

Citation address

https://hdl.handle.net/10070/672725

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 35 of 440. I I I I I I I I I I I I I I I I I I I I 34 . Tl'.BLE 6.3 cont. 14. After weighing, the residue is dissolved in 10 ml of dilute acid and the sulphate determinated by auto-analysis using APHA method 607. 15. Silica - this is ah~ays determined on the unfrozen sample following the introduction of frozen and unfrozen samples. The reasons for this are set out in a separate note. The method used initially was the Heterpoly blue method given in the APHA as 426C. Recently, the determination has been made on the auto analyser using Technicon II method 186-72W uses a similar reaction. Considerable cross checking has shown that both methods give identical results. 16. The remaining determinations are usually made on the thawed unfiltered sample. 17. Calcium, magnesium, sodium and potassium are determined by ~ . b ~. a~onuc a sorp~~on. 18. Chloride by APHA method 408C. 19. Fluoride by selection ion electrode by method APHA-414B. 20. Arsenic. A 10 fold concentration by evaporation with nitric - perchloric acid is made and the total arsenic determined by evolution as hydride using atomic absorption measurement similar to the APHA procedure 301A part VII. The modification used is the method of Thompson, K.C. and Thomerson, D.R., Analyst Vol.99 September 1974 pp 595 601, which uses sodium borohydride as reductant in preference to a zinc slurry and a heated silica tube in preference to a flame. This enables a better detection limit to be achieved. 21. Nitrate. Initially nitrate was determined after the nitrite determination by placing a cadmium column into the analyser and reading the samples again. However, ~,is is not always convenient and often the nitrates have been read later when reading the sulphates on the auto analyser. Cross-checking has shown there is no difference caused by making the determination a few days after the opening of the container. 22. Checking correctness of analysis - this has been done using APa~ procedure 104C. The anion-cation balance has been maintained at less than 0.05 milliequivalents whereas the APHA procedure accepts a difference of at least 0.1 for fresh water.


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