Detection method for simultaneously detecting contents of ammonia gas, methylamine, dimethylamine and trimethylamine in environment
A detection method and technology of trimethylamine, which are applied in the field of simultaneous detection of ammonia gas, trimethylamine content in the environment, dimethylamine and methylamine, can solve the problems of increased elution time and low measurement accuracy, and improve detection sensitivity. and chromatographic peak resolution, simple collection method, and short detection time.
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Embodiment 1
[0083] (1) Prepare mixed standard stock solution: weigh 0.3928g ammonium chloride (NH 4 Cl), 0.2772g methylammonium hydrochloride (CH 5 N HCl), 0.2284g dimethylamine hydrochloride (C 2 h 7 N HCl), 0.2063g trimethylamine hydrochloride (C 3 h 9 N·HCl) was dissolved in ultrapure water, and transferred to a 250mL volumetric flask to constant volume. Store below 4°C in the dark and refrigerate.
[0084] According to the concentration range of the ion to be measured and the detection sensitivity, prepare the standard solution. Pipette 5.00mL of ammonia standard stock solution, 20.0mL of methylamine standard stock solution, 20.0mL of dimethylamine standard stock solution and 20.0ml of trimethylamine standard stock solution into a 250mL volumetric flask and dilute to the marked line with water, and mix well. Prepare a mixed standard solution containing 10.0mg / L of ammonia, 40.0mg / L of methylamine, 40.0mg / L of dimethylamine and 40.0mg / L of trimethylamine. Store in polyethylene b...
Embodiment 2
[0111] The above-mentioned sample detection results were calculated by adding standard recovery experiments and precision experiments, and the results are as follows in Table 2 and Table 3:
[0112] Table 2 Standard addition recovery experimental results
[0113]
[0114]
[0115] Table 3 precision, accuracy experimental results
[0116]
[0117] From the results in Table 2 and Table 3 above, it can be concluded that this method is used to quantitatively detect ammonia, methylamine, dimethylamine, and trimethylamine in the mixed standard sample at the same time, and the linearity of ammonia is good within the concentration range of 0.25-10mg / L , the other three methylamines have good linearity in the concentration range of 1-40mg / , and the correlation coefficients are all above 0.9998. The standard addition recovery rate is between 80% and 120%. This method is fast, sensitive, and accurate. Concentration determination provides technical support.
Embodiment 3
[0119] Open the 10mL U-shaped porous glass plate absorption bottle with absorption liquid in each structure environment of a North China sewage treatment plant, connect the two ends of the air sampler, use 0.005mol dilute sulfuric acid as the absorption liquid, and absorb and collect air samples for 20 minutes at a flow rate of 1.0L / min Obtain sampling absorption liquid; the detection method of the present embodiment is the same as that of embodiment 1, and the peaks of ammonia, methylamine and dimethylamine only appear in order in this embodiment, so ammonia, methylamine and dimethylamine are contained in the environment.
[0120] The detection concentration values of ammonia, methylamine, dimethylamine and trimethylamine in the sampling absorption liquid in the present embodiment are shown in the following table 4:
[0121] The detection concentration of table 4 ammonia, methylamine, dimethylamine, trimethylamine
[0122]
[0123] Note: ND means not detected;
[0124] ...
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