CNH-8Ⅱ
Pesticide Residues Quick Tester
Applications
To detect the pesticide residues of organophosphate and carbamates in vegetables, fruits, grain, tea, water and soil.
Principle
Organophosphate and carbamate pesticides could inhibit the activity of acetylcholine enzyme existing in the insect central and peripheral nervous system, cause the accumulation of acetylcholine, and effect the normal conduction; so that make insect die from poisoning. The principle of this insect toxicology is used in the detection of pesticide residues. After adding reagent, we can determine the changing value of absorbance with time at 410nm using spectrophotometer, calculate the inhibition rate, and estimate the degree of organophosphate or carbamate pesticide residue in vegetables. Namely:
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Substrate acetylthiocholine(AsCH) is hydrolyzed into thiocholine and acetic acid choline at the presence of acetylcholinesterase (AChE). The color reaction is produced based on thio-choline and 3-Carboxy-4-nitrophenyl disulfide (DTNB), leading to the reaction solution turns yellow which shows an absorption peak at 410 nm. Use spectrophotometer to estimate the inhibitory extent of organophosphate and carbamate pesticides on enzyme activity to know about the extent of pesticide residues ( To represent by inhibition rate) , thus determine the harmfulness.
Technical Specifications
Wavelength: 410±2nm
Standard color developing time: 3 minutes
Rang of inhibition rate :0-100%
Environment temperature: 5~45 ℃
The detection limit :0.1~3 .0 mg / L (organic phosphorus and carbamate)
Standard warm-up time: 3 minutes
Zero transmittance drift: ≤ 0.5% / 3min
Photocurrent drift: ≤ 0.5% / 3min
Operating environment: Indoor / Outdoor / Automobile
Transmittance accuracy: ± 1.5%
Power supply: mains / car power
Repeatability: ≤ 1.0%
Channel error: ± 1.0%
Size: 380 × 240 × 110 mm
Weight: 7.5kg
Key Features
Test methods - enzyme inhibition method
Conform to GB / T 5009.199-2003 and NY/448-2001
Quick test, high accuracy, stable and reliable.
Integral high speed printer
8-channel testing technology
Large LCD screen display
Data logger-automatic data storage of 2000 results
Connects to different types of pc
Human-oriented interface
Intuitive display of apparatus operation status and setting parameters
Keypad beep and Beep alarm
