Introduction
Organic pollution is an important index of water body pollution, and a water body will be darkened with off odor if it contains too much organic matter. Traditional methods for test of organic matter, e.g. TOC, COD, BOD, take a long time and need expensive instruments, with high requirements and high cost of agents. Especially, conclusions can't be made immediately after a test in one of these methods. What's more, some virulent waste liquids may be discharged from such tests, which can harm the environment. Therefore, people are longing for a simple and feasible method instead. UV254 method is an originative method that emerges as the times require. 

Applying the principle that the absorption of ultraviolet light by common organic matters conforms to the Lambert-Beer law, this instrument uses a bundle of ultraviolet lights(UV) to test the total absorption (organic matter and turbidity), and another bundle of visible lights (VIS) for testing the turbidity absorption. Then the influence of turbidity is deducted through automatic processing by computer, the accurate absorption of pure organic matter can be obtained, and the content of organic matter is deduced. The whole course takes one second only.

This instrument uses a microcomputer chip for its core, a keyboard for operating, a LCD with back light unit for display of measuring results, and a built-in mini-printer for printing the measuring results dated with test time. It can store the test conditions of 100 points of different water samples for the use in future. It's portable, and suits to power supply for 100v, 110v, 220v, 240v and automobile power supply.

This method is recommended in Japan and the European countries. 

Applications
Strictly speaking, this instrument applies a method consistent with TOC, COD, BOD and other methods. At abroad, its reading (absorbency or absorption coefficient SAC - "UV254") is used for control of discharge capacity. In many situations, its reading is correlated with the readings obtained in TOC, COD and BOD methods, and the above index can be directly read after conversion. If there is not any national or regional standards for pollution discharge in this method, it's recommended to have a try of applying this method as an internal control method for monitoring the concentration change of organic matter  in water (for special absorption coefficient only), for cost cutting and time saving. This method can essentially complement traditional methods.

This instrument can be widely applied to surface water (rivers, lakes, reservoirs, seas and oceans), ground water, domestic sewage and industrial waste water discharged from urban sewage treatment plant, chemical plant, gas plant, cokeoven plant, paper factory, pharmaceutical factory, iron and steel plant, detergent factory, tannery, landfill percolate, dyeing plant, chemical fiber plant, agricultural products processing factory, beverage factory, milk plant, brewery, food factory, etc.

Features
A) Water quality monitoring of many sampling points by single instrument
The instrument can be used for direct testing on site or concentrative testing of many samples in a lab.
B) Quick indication of any reaction during technological flow
  There is a characteristic absorption coefficient corresponding to every reaction degree, and the particular reaction degree can be reckoned according to relevant characteristic absorption coefficient, on the premise that the type of measured object has been known. 
C) Able to deduct the influence of turbidity to make sample treatment unnecessary 

Specifications and Parameters:
Reading format: Abs, SAC (UV254), COD, TOC, BOD, turbidity
Measurement Range: 0-300m-1, or 0-3Abs. 
                         effect of turbidity deducted simultaneously.
                         (0-60 m-1 & 0-1500 m-1, Optional)
Accuracy: 10% 
Repeatability: 2%  
Stability: better than 0.005A/20min 
Display: 4x20 characters LCD display with backlight
Output: Printer(built-in)
               RS232c interface (can be connected with PC, Optional)
Power supply: AC100v-240v, 1A
Size: 346x280x125  mm
Weight: approx. 4kg (net weight), portable

Application Reference:
[1] Norio Ogura. Ultraviolet absorbing materials in natural water. Nippon. Kagaku Zasshi,1965,86(12):1286-1288.
[2] Yamamoto Katuhiro. Trial of an organic composition examination in natural water by UV spectrum[J].Kagaku to Kyoiku,1999,47(5):338-341.
[3]  Eatonad. Measuring UV-Absorbing Organics: A Standard Methods. Jour.AWWA,1995, 87(2):86-90.
[4]  Standard Methods For the Examination of Water and Wastewater (19th Edition). APHA, AWWA, WPCF,

Dear customer,

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Our business scope covers various fields such as biochemical analysis,environmental protection,industrial testing, bioscience,medical apparatus and instruments,internet technology and some frontier science.

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