Novel method for detecting zinc ion in water body
A detection method and technology for zinc ions, which are used in measurement devices, material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of difficult methods and expensive zinc ion detection instruments, and achieve high sensitivity, good hydrophilicity and biocompatibility. Sexual, method simple effect
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Embodiment 1
[0024] Put 5g of chitosan into a round bottom flask, add 100mL of 20% w / v sodium hydroxide solution at the same time and expand at room temperature for 2h. After the puffing is completed, weigh 15g of monochloroacetic acid and add it to the round bottom flask 4-5 times within 1 hour. During the addition process, gradually raise the temperature to 40°C. After the addition is completed, continue to stir and react under this condition for 2 hours. After the reaction was completed, the pH of the mixture in the flask was adjusted to 7.0 with 10% v / v glacial acetic acid solution. Then wash with 70% v / v methanol solution, then filter with Buchner funnel to collect the filter residue. The obtained sample was placed in a vacuum oven at 55° C. for more than 10 h to obtain dried carboxymethyl chitosan.
[0025] Weigh 1 g of the above-prepared carboxymethyl chitosan and place it in a beaker, add 49 ml of water and 1 ml of glacial acetic acid. At room temperature, the stirring was contin...
Embodiment 2
[0029] Put 5g of chitosan into a round bottom flask, add 100mL of 20% w / v sodium hydroxide solution at the same time and expand at room temperature for 2h. After the puffing is completed, weigh 15g of monochloroacetic acid and add it to the round bottom flask 4-5 times within 1 hour. During the addition process, gradually raise the temperature to 40°C. After the addition is completed, continue to stir and react under this condition for 2 hours. After the reaction was completed, the pH of the mixture in the flask was adjusted to 7.0 with 10% v / v glacial acetic acid solution. Then wash with 70% v / v methanol solution, then filter with Buchner funnel to collect the filter residue. The obtained sample was placed in a vacuum oven at 55° C. for more than 10 h to obtain dried carboxymethyl chitosan.
[0030] Weigh 0.5 g of the above-prepared carboxymethyl chitosan and place it in a beaker, add 49 ml of water and 1 ml of glacial acetic acid. At room temperature, the stirring was cont...
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