Tester for Pesticide residues introduction 1-Nanbei Instrument

Tester for Pesticide residues introduction 1

Testing Principle

After digestion to the sample , all metals (Arsenic, Lead,Mercury, Cadmium, Chromium) are into ionic form , heavy metal

and dithizone solution can form purple solution in near-neutralconditions . Solution color is proportional with content of

heavy metal in a certain concentration range , it obey“ Lambert-Beer Law “ :

E＝K*C*L

E：Extinction; K：Extinction Coefficient; C： SolutionConcentration; L： Solution Thickness .

We can get : C=E/KL

Suppose solution to be tested is C2，if K，L is same,

Then , C2=E2/E1*C1

We can get E2/E1 from instrument test ， C1 is standardsolution ，when we input C1 ，instrument can calculate and

display C2 automatically .

B、Technical Index :

1，Stability : displayed number(transmittance measurement) drift is less than 0.7 % (A) , within 3

minutes after powering on for 20 minutes .

2，Sensitivity : Kλ≥3.4×10-3 , （testing in Potassium dichromate standard solution）.

3，Repeatability : error ≤ 0.003 (A) , （testing in Potassium dichromate standard solution）.

4，Linear error : Absorbance range : 0.1～0.3，linear error ≤±6% ；0.3～0.6 , linear error : ≤

±4% ；0.6～0.8，linear error ≤ ±5%（testing in Potassium dichromate standard solution） .

1. Power consumption : ≤ 5W .

2. Cultivate heating power : ≤ 100W .

C、Testing Items :

1. Heavy metal in the food .

2. Pesticide residue in the food .

Nitrate and nitrite in the food .

Formaldehyde, sulfoxylate, Sulfur dioxide

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