turbidity standard

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• Turbidity — standards of 5, 50, and 500 NTU Turbidity is the cloudiness or haziness of a fluid caused by individual particles (suspended solids) that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key… …   Wikipedia

• Nephelometer — A nephelometer at the Kosan, Cheju Island, South Korea NOAA facility A nephelometer [1] is a stationary or portable instrument for measuring suspended particulates in a liquid or gas colloid. A nephelometer measures suspended particulates by… …   Wikipedia

• sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …   Universalium

• test — 1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a definite disease or of some substance in any of the fluids, tissues,… …   Medical dictionary

• Chetco River — Coordinates: 42°02′43″N 124°16′14″W / 42.04528°N 124.27056°W / 42.04528; 124.27056 …   Wikipedia

• Pelagic Ecology of the Low Salinity San Francisco Estuary — Pelagic organisms spend all or part of their lives in the open water, where habitat isdefined not by edges but by physiological tolerance to salinity and temperature. The LowSalinity Zone (LSZ) of the San Francisco Estuary constitutes a habitat… …   Wikipedia

• Water quality — A rosette sampler is used to collect samples in deep water, such as the Great Lakes or oceans, for water quality testing. Water quality is the physical, chemical and biological characteristics of water.[1] It is a measure of the condition of… …   Wikipedia

• Total suspended solids — is a water quality measurement usually abbreviated TSS. It is listed as a conventional pollutant in the U.S. Clean Water Act. This parameter was at one time called non filterable residue (NFR), a term that refers to the identical measurement: the …   Wikipedia

• Asahi Dam (Gifu) — Official name 朝日ダム Location Gifu Prefecture, Japan. Construction began 1946 …   Wikipedia

• NTU —    abbreviation for nephelometric turbidity unit, a unit used in measuring water quality. Turbidity is an optical property: the scattering and absorption of light by solids suspended in water. Turbid water has a cloudy or hazy appearance. An… …   Dictionary of units of measurement

• FAU —    abbreviation for formazin attenuation unit, a unit of water turbidity.    This unit is used to express turbidity measured by a nephelometer that measures directly the fraction of light transmitted through a water sample as compared to the… …   Dictionary of units of measurement