Nephelometric turbidity units definition

Nephelometric turbidity units or “NTUs” means the units used to describe turbidity. Nephelometric refers to the way the instrument, a nephelometer, measures how much light is scat- tered by suspended particles in the water.

Nephelometric turbidity units or “NTU” means a measure of turbidity based on a comparison of the intensity of the light scattered by the sample under defined conditions with the intensity of the light scattered by a standard reference suspension under the same conditions.

Examples of Nephelometric turbidity units in a sentence

• For the protection of the water contact recreation beneficial use, the wastes discharged to water courses shall have received adequate treatment, so that the turbidity of the treated wastewater does not exceed any of the following: (a) an average of 2 Nephelometric turbidity units (NTUs) within a 24-hour period; (b) 5 NTUs more than 5 percent of the time (72 minutes) within a 24-hour period; and (c) 10 NTU at any time.

• Nephelometric turbidity units (NTUs) are used as a rough index of the fine suspended sediment content of the water (Davies-Colley and Smith 2000).

• A partnership/consortium of NRB and/or foreign entity without Bangladeshi partner(s) is not eligible.

• For the protection of the water contact recreation beneficial use, the wastes discharged to water courses shall have received adequate treatment, so that the turbidity of the wastewater does not exceed any of the following: (a) an average of 2 Nephelometric turbidity units (NTUs) within a 24-hour period; (b) 5 NTUs more than 5 percent of the time (72 minutes) within a 24-hour period; and (c) 10 NTU at any time.

• Except as provided by paragraph (a)(3) of this section, for any construction activity of 30 or more acres, the discharge of stormwater shall not exceed the value listed in the following table: Pollutant or pollutant propertyMaximum forany time (NTU) 1Turbidity ....................................13 1 Nephelometric turbidity units.

• The effluent limitation for turbidity which reads, “For the protection of the water contact recreation beneficial use, the wastes discharged to water courses shall have received adequate treatment, so that the turbidity of the wastewater does not exceed: (a) a daily average of 2 Nephelometric turbidity units (NTUs); and (b) 5 NTUs more than 5 percent of the time (72 minutes) during any 24 hour period,” is based on the Basin Plan (page 3-17).

• The values obtained were expressed in Nephelometric turbidity units (NTU).

• Monitoring data from 1990 - 2006 indicate that the LVR exceeded the State water quality standard of 25 NTUs (Nephelometric turbidity units) 40 percent of the time, impairing its designated use for aquatic life.

• Nephelometric turbidity units (NTUs) and ranged from 0.1 to 165.0 NTUs than at a site in the Santa Ana River, where turbidity averaged 21.7 NTUs and ranged from 0.6 to 405.0 NTUs. Suckers were not detected at a different site in the Santa Ana River, where turbidity averaged 57.4 NTUs and ranged from 1.9 to 214.0 NTUs (Saiki 2000).

• Sensor must be suitable for range from [0] [ ] to [2] [20] [200] Nephelometric turbidity units (NTU).