NEPHELOMETRIC TURBIDITY UNIT (NTU)

Water turbid water where it is said to contain so many particles of suspended material that gives the color / appearance of the muddy and dirty. The materials that cause turbidity include mud, organic ingredients that are both good and suspended particles other.

Nephelometer is an instrument for measuring turbidity results in Nephelometric Turbidity Units units (NTUs). NTUs is the standard unit for measuring turbidity. In nephelometri and turbidimetri, the light source is projected through a liquid sample is stored in a transparent sample container. Generally, nephelometri using a light source that has a relatively short wavelength (eg, 500 nm-800 nm) and effectively used to detect very small particle size. Meanwhile, turbidimetri generally use a light source that has a longer wavelength (eg, 800 nm-1100 nm) and effectively used to detect particles with a larger size. If a beam of light is passed through the sample turbid, scattering intensity is reduced, and the amount of scattered light depends on the concentration and particle size distribution. In nephelometri intensity of the scattered light is measured, whereas in turbidimetri, the intensity of the light transmitted through the sample is measured.

Sources: http://utarisumadewi86.blogspot.com/2012/01/nephelometer.html

Turbidity or cloudiness of water caused by the clay to sand, organic and inorganic substances are smooth, plankton and other microorganisms. Turbidity standards set between 5-25 NTU (Nephelometric Turbidity Units) and when exceeding a predetermined limit will cause:

1. Disrupt the aesthetic

2. Reduce water disinfection efekifitas

There are several methods of measuring turbidity is:

1. Nephelometric method, nephelometric turbidity units turbidity principle in this way is based on a comparison of the intensity of light caused by a standard solution in the same condition, the higher the intensity of the absorbed higher turbidity tools used several turbidi meter sample tube.

2. Visual method, Jakson Turbidity Units. What is meant by the visual method is the measurement of turbidity using cadle turbidi meter. measurement principle is based on the length of light through a susspensi are calculated exactly when the shadow flame (candle) is lost. The longer the candle TURBIDIMETER, turbidity bottle to compare visually.

3. Turbiditer holigne, used to measure the turbidity of 0-15 units. The principle works is lighting effects in the preparation tundal light source for water samples. In this case, do not use the standard suspension.