Boyne River and South Trees Inlet (Basin 133)

DSITIA staff sample Chlorophyll-a, observe Secchi depth and measure physiochemicals at six Boyne River and South Trees Inlet sites and sample nutrients at three sites.

Period of operation: From 1993 to 2013
Region: Central Coast Queensland
Australian drainage basin: 133
Water body: Tidal estuarine sections of the Boyne River and South Trees Inlet at mid-stream monitoring sites
Water column profile depth: Monitoring starts at a depth of 0.2m near the water surface and the water column profile is monitored at regular 2m intervals plus the last available depth greater than 0.5m above the bottom
Secchi depth: AS 3550.7-1993
Algal biomass Chlorophyll-a : APHA & AWWA (1998) monochromatic method [Ref: Lorenzen, Carl J. (1967) Limnology and Oceanography, Vol12: pp343-346.]
in situ physiochemical profile: Currently the in situ physiochemical depth profiles are measured with YSI model 6-Series Sondes such as the YSI 6920 V2 handheld multi probe sonde connected to a data recorder. The YSI 6920 V2 has been in use since 2011. The YSI 610 – 650 was used from 1998 to 2012. The YSI 3800 was used from 1993 to 2001. Up to 1998 a range of Martek, Hydrolab and TPS instruments as well as some earlier YSI models were used. [Ref YSI Multiparameter Water Quality Sondes User Manuals]

Dissolved Oxygen concentration (mg/L)
Dissolved Oxygen % saturation (%)
pH
Salinity (PSU)
Specific Conductance at 25 deg C (mS/cm)
Temperature (°C)
Turbidity (NTU)

Surface nutrient samples: APHA (1998) Queensland Health Forensic and Scientific Services photochemical methods using a flow injection analyser (FIA). A laboratory method change in 1997 improved the Kjeldahl digestion of samples resulting in a lower Organic Nitrogen detection limit. In 1999, a change in the laboratory instrument has led to slightly lower and more stable Nitrogen Oxides and Filterable Reactive Phosphorus results. A 1999 change replaced the higher temperature and stronger acid concentration Kjeldahl digestion with Persulphate Oxidation digestion which in some circumstances will extract less P from particulates with the effect of an apparent small reduction in Total Phosphorus results. These changes are mostly apparent at low levels and the differences lie within the precision range of the method.

Ammonia as N (mg/L)
Organic Nitrogen as N (mg/L)
Nitrogen Oxides as N (mg/L)
Total Nitrogen as N (mg/L)
Filterable Reactive Phosphorus as P (mg/L)
Total Phosphorus as P (mg/L)

Field	Value
Data last updated	5 February 2015
Metadata last updated	20 June 2022
Created	22 December 2014
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Data Dictionary

Additional Information

Boyne River and South Trees Inlet (Basin 133)

Data Dictionary

1.LOCATION_ID_BSA numeric

2.LOCATION_NAME text

3.Lat_GDA94 numeric

4.Long_GDA04 numeric

5.SURVEY_DATE timestamp

6.Time_HHMMSS numeric

7.Depth_m numeric

8.Data qualifier for Chlorophyll-a (ug/L) text

9.Chlorophyll-a (ug/L) numeric

10.Data qualifier for Secchi depth (metres) text

11.Secchi depth (metres) numeric

12.Data qualifier for Ammonia as N (mg/L) text

13.Ammonia as N (mg/L) numeric

14.Data qualifier for Nitrogen Oxides as N (mg/L) text

15.Nitrogen Oxides as N (mg/L) numeric

16.Data qualifier for Total Nitrogen as N (mg/L) text

17.Total Nitrogen as N (mg/L) numeric

18.Data qualifier for Organic Nitrogen as N (mg/L) text

19.Organic Nitrogen as N (mg/L) numeric

20.Data qualifier for Dissolved Oxygen concentration (mg/L) text

21.Dissolved Oxygen concentration (mg/L) numeric

22.Data qualifier for Dissolved Oxygen % saturation (%) text

23.Dissolved Oxygen % saturation (%) numeric

24.Data qualifier for pH (Unit) text

25.pH (Unit) numeric

26.Data qualifier for Filterable Reactive Phosphorus as P (mg/L) text

27.Filterable Reactive Phosphorus as P (mg/L) numeric

28.Data qualifier for Total Phosphorus as P (mg/L) text

29.Total Phosphorus as P (mg/L) numeric

30.Data qualifier for Salinity (PSU) text

31.Salinity (PSU) numeric

32.Data qualifier for Specific Conductance at 25 deg C (mS/cm) text

33.Specific Conductance at 25 deg C (mS/cm) numeric

34.Data qualifier for Temperature (deg C) text

35.Temperature (deg C) numeric

36.Data qualifier for Turbidity (NTU) text

37.Turbidity (NTU) numeric

Additional Information