24) Only one of the following four statements is TRUE (A) Activated carbon is ef

Question

24) Only one of the following four statements is TRUE (A) Activated carbon is effective at removing microbial contamination and organic soluble substances from wae (B A key feature of the Formaizin Attcnuation Unit (FA) design technology to measure water turbidity is thas the aet is geometrically centered at 90 relative to the incident light beam thus allowing to create devices which are both porta and accurate for daily plant and field monitoring applications (C) NTU is most often used when referencing the USEPA Method 180.1 or Standard Methods for the Examination and Wastewater, because the design technolegy of these devices (nephelometers) is significantly move aceurste at levels below 1 D) There are always two end-points in alkalinity titrations

Explanation / Answer

option (C) is right.

A turbidity meter consists of a light source that illuminates a water sample and a photoelectric cell that measures the intensity of light scattered at a 90 angle by the particles in the sample  It measures turbidity in nephelometric turbidity units or NTUs. Meters can measure turbidity over a wide range from 0 to 1000 NTUs.

FAU or Formazin Attenuation Units signify that the instrument is measuring the decrease in transmitted light through the sample at an angle of 180 degrees to the incident light. This type of measurement is often made in a spectrophotometer or colorimeter and is not considered a valid turbidity measurement by most regulatory agencies.

generally one end point in alkalinity titration.

activated carbon removes mineral salts etc.

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