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 34 of 440. - - - - -- -- - .. ---- -~---- . -- . ::':~:---;: ~;:-- "':--'7!:"-~ 33. TABLE 6. 3 (cont.) THE SEQUENCE OF DETERMINATIONS USED FOR WATER ANALYSIS (1979) The procedures are taken from the APHA 14th Edition. On opening the container, determinations 1vhich are subject to loss or oxidiation by the air are read immediately on the same day. l. 2. 3. 4 5 . 6 These determinations are: Ferrous iron by method 310A 4b page 211 Immediately after opening the container a small portion of sample is filtered to remove suspended iron, and a 50 ml aliquot is taken. This is acidified and concentrated by evaporation when convenient, to give a 10 fold concentration and the total iron in solution is determined by atomic absorption, suspended iron having been previously filtered off. The ferric iron is determined by subtracting the ferrous iron from the total soluble iron. Nitrite - auto analyser Technicon II method 158-71W. Nitrate - auto analyser Technicon II method 158-7lW. Ammonia - by Orion instruction manual for electrode 95-10. pH- APrL"'.-424. 7. Alkalinity- APHA-403 40. 9. Turbidity (N.T.U.) - APHA-214A. 10. An aliquot is taken for phosphorus. This is treated with sulphuric acid, ammonium persulphate and evaporated to 10 ml according to method 425C part III. The colour is developed and read by procedure 425F usually in the next day or so. 11. Specific conductance using method APP~-205. 12. When only one sample was received the sample was then filtered to determine the total suspended matter. This resulted in some silica being lost by filtration and high suspended matter values being obtained, particularly for water with a low pH (6) and high silica content (lOmg/1). When two samples were received the total suspended matter was determined on the unfrozen sample by filtering the whole of the sample through a fibreglass filter and weighing the residue as given in procedure 2080. The filtrate is then returned to a clean bottle. 13. On t...'le above filtrate the determir,ation of "total ::'iltrable residue'' is made by evaporating an aliquot to dryness and drying at l80C following APHA 208B. I I I I I I I I I I I I I I I I I I I I


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