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Concept

Nephelometric Turbidity Units

URI http://vocab.nerc.ac.uk/collection/P06/current/USTU/3/
Within Vocab BODC-approved data storage units
Alternative Labels NTU
Definition Standardised scale for nephelometric measurement of turbidity calibrated against formazine solutions of different concentration and measured using a white light source at a 90 degree detection angle. Earlier measurements of turbidity tended to use NTU (sometimes also labelled STU or FTU) as the unit regardless of the measurement method.
Date 2018-04-16T12:05:57
Identifier SDN:P06::USTU
Note accepted
Is Version Of USTU
Previous Version 1 , 2
version 3
Same As QUDT concepts http://qudt.org/vocab/unit/NTU
Broader P24:DIMLESS [dimensionless]
Related R03:TURBIDITY seawater turbidity
A05:EV_POM Suspended particulates
P09:TUR4 TURBIDITY
P01 BODC Parameter Usage Vocabulary - (13) [+]
P01:TURBXXXX Turbidity of water in the water body
P01:TURBAQ01 Turbidity of water in the water body by Aquatracka nephelometer and laboratory calibration against formazin
P01:TURBPR02 Turbidity of water in the water body by in-situ optical backscatter measurement (second sensor) and laboratory calibration against formazin
P01:TURBPR01 Turbidity of water in the water body by in-situ optical backscatter measurement and laboratory calibration against formazin
P01:TURBMOXX Turbidity of water in the water body by Moderate Resolution Imaging Spectroradiometer (MODIS)
P01:TURBMEXX Turbidity of water in the water body by programmable medium-spectral resolution imaging spectrometer (MERIS)
P01:TURBSC01 Turbidity of water in the water body by SCUFA turbidity meter and laboratory calibration against formazin
P01:TURBSP02 Turbidity of water in the water body by SeaPoint turbidity meter (second sensor) and laboratory calibration against formazin
P01:TURBSP01 Turbidity of water in the water body by SeaPoint turbidity meter and laboratory calibration against formazin
P01:TURBSS01 Turbidity of water in the water body by SeaTech light backscatter nephelometer (LBSS) and laboratory calibration against formazin
P01:TURBTNTX Turbidity of water in the water body by through-flow nephelometer
P01:TURBPR12 Turbidity standard deviation of water in the water body by in-situ optical backscatter measurement (second sensor) and laboratory calibration against formazin
P01:TUSDPR01 Turbidity standard deviation of water in the water body by in-situ optical backscatter measurement and laboratory calibration against formazin

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