Preparation method of ion selective electrode capable of measuring trace chromium (III)
An ion-selective and electrode technology, applied in the field of determination of chromium content in wastewater, can solve the problems of cumbersome operation and difficulty in wide application, etc.
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[0022] (1) Synthesis of o-vanillin acetal -4-aminoantipyrine:
[0023] Weigh 3.04g of o-vanillin into a 250mL three-neck flask, add 60mL of ethanol, heat to reflux until the solid dissolves, dissolve 4.06g of 4-aminoantipyrine in 60mL of ethanol, and add this solution dropwise to the above-mentioned o-vanillin solution , heated to reflux for 1 hour, bright yellow crystals precipitated, cooled, filtered with suction, collected the solid, and recrystallized with ethanol for 2 to 3 times to obtain the target product o-vanillin-4-aminoantipyrine Schiff base ( figure 1 )5.12g, yield 72.11%.
[0024] Compare the infrared spectra of 4-aminoantipyrine and o-vanillin-4-aminoantipyrine ( figure 2 ), found that vN-H (3327cm -1 、3432cm -1 ) of the two characteristic absorption peaks disappeared in o-vanillin acetal-4-aminoantipyrine, and vC=N characteristic absorption peak 1600cm appeared -1 , indicating the formation of a new product Schiff base.
[0025] (2) Preparation of solid...
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