Los Angeles River
CSLC 2019
Abbreviations
LAR LA River
Temp Temperature
DO Dissolved Oxygen
Cond Conductivity
Sal Salinity (Practical Salinity Units, PSU)
(ocean water is typically 33-35 PSU)
ORP Oxygen Reduction Potential
Turb Turbidity (Formazin Nephelometric Units, FNU)
(see USGS description of turbidity units below)
*I need to confirm the probe is measuring turbidity correctly - the values we measured are lower than I anticipated
Stop 1 - LAR Balboa
Temp 23.3 °C
DO 71.6 %
DO 6.07 mg/L
Cond 1932 µS/cm
Sal 1.02 PSU
pH 7.94
ORP 204.2 mV
Turb 1.51 FNU
Lat/Lon 34.17966° -118.50103°
Stop 2 - Haskell Ck
Temp 26.3 °C
DO 64.8 %
DO 5.22 mg/L
Cond 768 µS/cm
Sal 1.36 PSU
pH 6.81
ORP 218.4 mV
Turb 2.48 FNU
Lat/Lon 34.17709° -118.47398°
Stop 3 - LAR McAdams Riverfront Park
Did Not Sample
Stop 4 - LAR Frogtown
Temp 22.2 °C
DO 104.5 %
DO 9.0 mg/L
Cond 1091 µS/cm
Sal 0.57 PSU
pH 7.14
ORP 125.2 mV
Turb 12.42 FNU
Lat/Lon 34.08589° -118.22818°
more details RE: units of turbidity
https://or.water.usgs.gov/grapher/fnu.html
The differences are based mainly on the wavelength of the light used to make the measurement, the angle at which the scattered light is detected, the number of detectors, and any special signal processing. For example, a Formazin Nephelometric Unit (FNU) is similar to a Nephelometric Turbidity Unit (NTU) in that both measure scattered light at 90 degrees from the incident light beam, but the FNU is measured with an infrared light source according to the ISO 7027 method whereas the NTU is measured with a white light according to EPA method 180.1
Priya M. Ganguli, Assistant Professor
Geological Sciences, CSUN
18111 Nordhoff St., Northridge, CA 91330-8266
Ph: 818-677-4669
Lab: Live Oak 1224