Method for measuring aromatic amine in crayons
A method for measuring aromatic amines, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of unsuitable detection of aromatic amines in crayons, and achieve the effect of avoiding matrix interference and easy method
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Embodiment 1
[0022] 1. Determination of aromatic amines in crayons
[0023] (1) Crayon sample processing
[0024] (1) Weigh a crayon of a certain quality, cut it into small pieces with a clean blade, use n-hexane to perform ultrasonic pretreatment on the crayon piece, discard the n-hexane, and then volatilize it to nearly dry under ventilated conditions to obtain the pretreated sample ;
[0025] (2) Use methanol to ultrasonically extract the pretreatment sample twice, and add methanol according to the ratio of 1 gram of crayon / 40ml of methanol;
[0026] (3) After centrifuging the extract, collect the clarified solution into a chicken heart bottle, and use a rotary evaporator to dry it until it is nearly dry, and then dry it with a slow nitrogen flow;
[0027] (4) Add 200mg / ml sodium dithionite solution (200mg / ml sodium dithionite solution prepared with a citrate buffer solution of pH 6 as a solvent) into the chicken heart bottle, and add dithionite at a ratio of 1 gram of crayon / 0.6 gram...
Embodiment 2
[0058] The mensuration of aromatic amine in embodiment 2, crayon
[0059] 1. Determination of aromatic amines in crayons
[0060] (1) Crayon sample processing
[0061] (1) Weigh a crayon of a certain quality, cut it into small pieces with a clean blade, use cyclohexane to perform ultrasonic pretreatment on the crayon small pieces, discard the cyclohexane, and then volatilize it to nearly dry under ventilated conditions to obtain the former processing samples;
[0062] (2) Use acetonitrile to ultrasonically extract the pretreatment sample twice, and add acetonitrile according to the ratio of 1 gram of crayon / 60ml of acetonitrile;
[0063] (3) After centrifuging the extract, collect the clarified solution into a chicken heart bottle, and use a rotary evaporator to dry it until it is nearly dry, and then dry it with a slow nitrogen flow;
[0064] (4) Add 200mg / ml sodium dithionite solution (200mg / ml sodium dithionite solution prepared with a citrate buffer solution of pH 6 as ...
Embodiment 3
[0078] The mensuration of aromatic amine in embodiment 3, crayon
[0079] 1. Determination of aromatic amines in crayons
[0080] (1) Crayon sample processing
[0081] (1) Weigh a crayon of a certain quality, cut it into small pieces with a clean blade, use heptane to perform ultrasonic pretreatment on the crayon piece, discard the heptane, and then volatilize it to nearly dry under ventilated conditions to obtain a pretreatment sample ;
[0082] (2) Use isopropanol to ultrasonically extract the pretreatment sample twice, and add isopropanol according to the ratio of 1 gram of crayon / 20ml of isopropanol;
[0083] (3) After centrifuging the extract, collect the clarified solution into a chicken heart bottle, and use a rotary evaporator to dry it until it is nearly dry, and then dry it with a slow nitrogen flow;
[0084] (4) Add 200mg / ml sodium dithionite solution (200mg / ml sodium dithionite solution prepared with a citrate buffer solution of pH 6 as a solvent) into the chick...
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