Sulfide detection method
A detection method and sulfide technology, applied in the field of analytical chemistry, can solve problems such as the limitation of detection sensitivity of operation convenience, and achieve the effect of low detection limit, low detection limit and high sensitivity
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Embodiment 1
[0069] This embodiment provides a method for detecting sulfide, which specifically includes the following steps:
[0070] (1) Dilute the sulfide (NaS) standard solution with a concentration of 100 mg / L purchased from the National Center for Standard Materials 10 times to obtain a standard solution with a concentration of 10 mg / L; take 5 mL of primary water, and add 10 μL of 10 mg / L to it / L of sodium sulfide standard solution to obtain a test solution with a concentration of 0.02 mg / L; take 5 mL of this test solution and mix it with 100 μL of derivatization reagent to rapidly generate derivatization products, i.e. methylene blue compounds;
[0071] (2) Take 100 μL of the derivatized product in the sample cell, then add 100 μL of Raman surface enhancer and 50 μL of coagulation accelerator, mix well and place it in a Raman spectrometer for detection, set the laser power to 100 mW, and the integration time to 500 ms, Get the Raman spectrum;
[0072] (3) In the Raman spectrum, th...
Embodiment 2
[0075] The difference between this embodiment and embodiment 1 is that in step (1), the sulfide concentration of the liquid to be tested is 0.04mg / L; figure 2 It is the Raman spectrum in this embodiment, wherein, 1 is the Raman spectrum line of the sample to be tested, and 2 is the Raman spectrum line of the blank control.
Embodiment 3
[0077] The difference between this embodiment and embodiment 1 is that in step (1), the sulfide concentration of the liquid to be tested is 0.08mg / L; image 3 It is the Raman spectrum in this embodiment, wherein, 1 is the Raman spectrum line of the sample to be tested, and 2 is the Raman spectrum line of the blank control.
[0078] Longitudinal comparison of the Raman spectrograms of Examples 1 to 3, it can be seen that under the same detection parameter setting, with the increase of the sulfide concentration in the liquid to be tested, the 453cm -1 and 483cm -1 The intensity of the characteristic peak at the position is also enhanced, which proves that the detection method provided by the present invention can also realize the quantitative detection of sulfide in water.
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