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Atomic Fluorescence Spectrometry in the Determination of arsenic and mercury in agricultural products

Sub-simultaneous detection of fluorescence spectrometer for agricultural products of arsenic and mercury, either through spike recovery tests or test national standard, the detection limit, accuracy and precision,[link widoczny dla zalogowanych], can better meet the requirements, sample preparation is relatively simple, convenient suitable for a large number of laboratory samples, AFS sequential injection of a 930 dual-channel atomic fluorescence spectrometer with a high degree of automation, injection accuracy,[link widoczny dla zalogowanych], low detection limit, high sensitivity, good reproducibility advantages. This method is applicable to a large number of laboratory analysis of samples. 5 some of the recommendations (1) The use of ultra-pure water,[link widoczny dla zalogowanych], the use excellent pure acid than the best,[link widoczny dla zalogowanych], careful not to be too high temperature of the digestive process, acid usage type, quantity to minimize, to reduce the blank value. (2) Preparation of potassium borohydride solution, the correct approach is to potassium borohydride with potassium hydroxide dissolved in pure water. The existing service is the best use of potassium borohydride unused solution can be put in the refrigerator at 4 ��. (3) the digestion must be a good sample of thiourea over a 15min reduction of ascorbic acid mixture to make 5 reduced to 3 pre-Arsenic Arsenic. (4) digestion process must be patient, careful, strict control of temperature, can not speed up the digestion rate and the temperature rises over; digestion is better to use a small flat-bottomed tall beaker, to prevent local liquid evaporated, the arsenic, mercury losses . (5) digestion as far as possible not to use perchloric acid, perchloric acid boiling point as high (72 when the 203 volatile arsenic, mercury losses, samples of animal protein as fat higher, use perchloric acid, nitric acid digestion, or may be incomplete digestion is not necessarily clarified, therefore, be based on specific sample, try to avoid or heightening less acid; to determine whether the complete digestion in addition to observation, can be taken to continue the heating, if the remaining digestive juice changes the black, indicating there was carbonized organic matter proved incomplete digestion; hydrogen peroxide can accelerate organic matter digestion, digestion of plant sample fast completely,[link widoczny dla zalogowanych], you can add 1mL of hydrogen peroxide to help digestion.
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