Method for selectively and quantitatively collecting and measuring chromium (VI) in aquatic environment
A quantitative collection and water environment technology, applied in color/spectral characteristic measurement, test sample preparation, sampling device, etc., can solve problems such as inability to measure chromium (VI) content, no enrichment function, etc., and reach the detection limit Low cost, convenient collection, and simple collection device
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Embodiment 1
[0044] 1) Pretreatment of dialysis membrane
[0045] Soak a dialysis membrane (cellulose acetate membrane) with a molecular weight cut-off of 2000-14000 in deionized water and boil, change the water every 20 minutes, and the cumulative boiling time is 2 hours;
[0046] 2) Pretreatment of binders
[0047] Use the cellulose acetate membrane pretreated in step 1) to make a dialysis bag, weigh 50g of the liquid binder didodecanylamine polyoxyethylene ether diquaternary ammonium salt, dilute it with 80mL of deionized water and put it into the dialysis bag In the bag, soak in deionized water for 168h for purification, and replace the deionized water every 24 hours;
[0048] 3) Installation of acquisition device
[0049] Prepare the purified binding agent into 0.020mol / L didodecanylamine polyoxyethylene ether diquaternary ammonium salt solution, and take 3 collection devices made of polypropylene with a volume of 2mL (such as figure 1As shown), the acquisition device includes a fi...
Embodiment 2
[0058] 1) Pretreatment of dialysis membrane
[0059] Soak a dialysis membrane (cellulose acetate membrane) with a molecular weight cut-off of 2000-14000 in deionized water and boil, change the water every 20 minutes, and the cumulative boiling time is 2 hours;
[0060] 2) Pretreatment of binders
[0061] Use the cellulose acetate membrane pretreated in step 1) to make a dialysis bag, weigh 40g of the liquid binder didodecylamine polyoxyethylene ether triquaternary ammonium salt, dilute it with 100mL deionized water and put it into the dialysis bag Within 168 hours, soak in deionized water for purification, and replace the deionized water every 12 hours;
[0062] 3) Installation of acquisition device
[0063] Purified binding agent is made into 0.050mol / L didodecylamine polyoxyethylene ether triquaternary ammonium salt solution, and 12 collection devices whose material is polypropylene and volume is 2ml, the collection device structure is the same as embodiment 1; Fill the c...
Embodiment 3
[0072] 1) Pretreatment of dialysis membrane
[0073] Soak a dialysis membrane (cellulose acetate membrane) with a molecular weight cut-off of 2000-14000 in deionized water and boil, change the water every 30 minutes, and the cumulative boiling time is 2 hours;
[0074] 2) Pretreatment of binders
[0075] Use the cellulose acetate membrane pretreated in step 1) to make a dialysis bag, weigh 20g of the liquid binder polyquaternary ammonium salt, dilute it with 50mL of deionized water and put it into the dialysis bag, soak in deionized water for 120h For purification, replace the deionized water every 24 h;
[0076] 3) Installation of acquisition device
[0077] The binding agent of purification is made into 0.050mol / L polyquaternary ammonium salt solution, gets 12 material and is the collection device that polytetrafluoroethylene volume is 2ml, and this collection device structure is the same as embodiment 1; Pack into 2ml0. .050mol / L polyquaternary ammonium salt solution, se...
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