Application of bagasse-based magnetic activated carbon in detection of triazine herbicide in brown sugar
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A magnetic activated carbon, bagasse technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of threat, high toxicity, long half-life of triazine herbicides, etc., and achieves low detection limit, short time consumption, high sensitivity high effect
Active Publication Date: 2021-06-01
广东省科学院生物与医学工程研究所
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In addition, due to the long half-life and high toxicity of triazine herbicides, it has be
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Embodiment 1
[0024]Detection method of triazine in a brown sugar, including the following steps:
[0025](1) 40 g of a 20 mL of a mass fraction was added to a phosphoric acid solution of 85%, and stirred at 85 ° C for 2 h, separated, and the vacuum oven was dried at 80 ° C for 36 h. The dried product was transferred to the tube furnace for carbonization, AR protection, AR flow rate of 100 ml / min, touched by 2 ° C / min, temperature was increased from 25 ° C to 450 ° C, 450 ° C insulation for 2 h, naturally cooled to room temperature . The product was taken out, washed to neutral with distilled water, and dry grinding to obtain porous biocompatient.
[0026](2) Take the porous biopropocentric 15g obtained by step (1), ultrasonic dispersion to 200 ml of distilled water, the whole argon is protected, the temperature is increased to 70 ° C, and 0.1047 g of COCl is added to the mechanical stirring2· 6h2O, 0.4894G FESO4· 7h2O and 1.1893G fecl3· 6h2O, add ammonia water to adjust the pH to 10, continue to r...
Embodiment 2
[0036]As in Example 1, in different, 50% phosphoric acid solution was added to 300 ml, and 20 mg of magnetic bio-carbon was added, and the inorganic salt concentration was 2%.
[0037]Ximashi, methylamine, atraneum and the purity of the grass were 77.8%, 74.9%, 80.9% and 68.5%, and the precision RSD values were 2.0%, 4.6%, 1.1% and 2.8, respectively. %.
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Abstract
The invention discloses bagasse-based magnetic activated carbon and application thereof in detection of a triazine herbicide in brown sugar. The bagasse-based magnetic activated carbon is prepared by the following steps: (1) adding a phosphoric acid solution into pretreated bagasse, uniformly dispersing, filtering, drying filter residues obtained by separation, transferring the filter residues into a reaction container, heating, introducing argon to obtain porous biochar, and washing, drying, and grinding the porous biochar for later use; and (2) ultrasonically dispersing the porous biochar obtained in the step (1) in an aqueous solution, introducing nitrogen, adding CoCl2. 6H2O, FeCl3. 6H2O and FeCl2. 4H2O, heating, dropwise adding an ammonia water solution to adjust the pH value to 10, collecting by a magnet to obtain bagasse-based magnetic biochar, and washing and drying the bagasse-based magnetic biocha for later use. The bagasse-based magnetic activated carbon provided by the invention is simple in preparation method and low in cost, the sample pretreatment process is simple and convenient to operate and short in time consumption, and the method for detecting triazine herbicide in brown sugar provided by the invention is high in sensitivity and good in repeatability.
Description
Technical field[0001]The present invention relates to the field of food safety techniques, and more particularly to a sugarcane slag substrate magnetic activated carbon and its application in a triazine herbicide in the detection of brown sugar.Background technique[0002]Triazine herbicides are a more selective herbicide using more agricultural production, generally used to control weed growth. Because of its efficient weeding effect, it quickly became the world's hot products. However, due to its stable chemistry, it is difficult to degrade, the mobility is high, which is widely distributed, resulting in rapid accumulation in soil and water, and has become the main source of ecological environmental pollution through surface runoff and emissions into the environmental system. In addition, since the half-life of triazine is long, the toxicity is large, it has become a risk factor of threatening land, aquatic, reptiles and human health. Studies have shown that long-term contact triazi...
Claims
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