Alligator Rivers region regional surface water quality monitoring : November 1978 - April 1981
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
Northern Territory Government
Report ; 49/1983
3 volumes. ; 30 cm
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
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]
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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