Preprocess-free detecting and sampling apparatus and detecting method for hydrogen sulfide in sewerage

Abstract

The invention relates to a pre-processing-free test sampling device and a testing method for testing the hydrogen sulfide in sewage, particularly providing a test sampling device and a testing method which is free of pre-processing and has the advantages of low cost, small floor interference, and the hydrogen sulfide density in sewage can be determined easily at site or at the original position. The sampling device is provided with an external pipe, an internal pipe, a retainer ring and a gas-liquid separating film, the internal pipe is arranged in the middle of the external pipe, the gas-liquid separating film is covered on the upper and the lower cross-sections of the external pipe and then fixedly embedded on the upper and the lower cross-sections of the internal pipe by the retainer ring. Developer solution is added into the internal pipe of the sampling device, and then the sampling device is arranged in the sample cup filled with water sample under test; 0.1-10 percent of hydrochloric-acid solution of relative water sample is added into the water sample, the sulfureted hydrogen in the water diffuses through the gas-liquid separating film and enters into the sampling device and the color is developed; the test solution in the sampling device is filled into a colorimetric container, the water is taken as reference, and the absorbance value is measured at 665nm by a spectrophotometer; the sulfureted hydrogen density in the water sample is measured by a standard working curve, and semiquantitative method can also be adopted to measure the density rapidly by optical colorimetry.

Description

technical field [0001] The invention relates to a detection sampling device and a detection method for hydrogen sulfide concentration in sewage. Background technique [0002] Sulfide is one of the important indicators of water quality. Hydrogen sulfide is easily produced in waters with rich organic matter, insufficient dissolved oxygen, and low pH. Hydrogen sulfide is extremely harmful to organisms. In aquaculture waters, when its concentration is higher than 0.1mg / L, the growth speed, physical strength and disease resistance of fish, shrimp, crab and turtle will be weakened; when the concentration rises to 0.5mg / L , will cause difficulty breathing and even death of fish, shrimp, crab and turtle. Therefore, rapid detection of hydrogen sulfide in water is one of the key measures to prevent poisoning of aquaculture organisms. On the other hand, crowd poisoning and even death incidents caused by hydrogen sulfide also occur from time to time. Therefore, in places such as sewer...

AI Technical Summary

Problems solved by technology

These classic methods have high requirements on the substrate of water samples, and the sewage needs to be pretreated by acidification-air blowing, etc., which takes several hours, the steps are cumbersome, time-consuming and labor-intensive

In recent years, there have been new developments in the rapid determination of hydrogen sulfide in water, such as the color method of lead acetate test paper, but its detection limit is too high (20 ~ 200mg H 2 S / L)

Images