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首页 » 杰博新闻中心 » 杰博资讯 » 行业资讯 » 水因素对红外碳硫仪结果的影响 You are here: Home » Jiebo News Center » Jiebo News » Industry News » Effects of water factors on the results of infrared carbon and sulfur analyzer

Influence of Water Factors on Results of Infrared Carbon and Sulfur Analyzer

】 Article Source: Editor-in-Chief: Release time: 2019-08-28 09:36:00 Hits: - [Big Middle Small]
The interference factors of the infrared carbon and sulfur analyzer are generally considered to come from three aspects: first, the defect of the instrument structure; second, the use of oxygen, reagents, and the sample itself; and third, the measurement conditions are not properly selected. In practical use, the interference mainly comes from the influence of water on the accurate determination of sulfur.

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Infrared carbon sulfur analysis is to make the carbon and sulfur in the material burn in oxygen to form CO2 and SO2. The carrier gas oxygen is sent to the carbon detection tank and the sulfur detection tank. Because CO2 and SO2 absorb infrared light of a specific wavelength, the content of C and S in the material is calculated based on the relationship between light intensity and concentration.
The infrared absorption wavelength of CO2 was 4.25 μm, and the infrared absorption wavelength of SO2 was 7.45 μm. Water has strong absorption in the infrared spectral region, and the absorption peaks are located at two wavenumbers of 1670 ~ 1600cm-1 and 3600 ~ 3000cm-1, which partially overlap with the absorption peaks of SO2, thereby causing dry interference. Indicated as high sulfur value or bad combustion curve, tailing occurs, and the integration time is extended until it cannot be reset to zero.
In the actual reaction of the infrared carbon and sulfur analyzer, the hygroscopic agent is saturated, and the water absorbs SO2 to generate H2SO3 and then decomposes again, causing unstable interference; the water-containing substances (including crystal water) are combusted to release water. This interference can only be eliminated by absorbing moisture from the hygroscopic agent. Correctable interferences include: crucible flux, extremely low and constant moisture content in oxygen. The desiccant is in an unsaturated state. At this time, the moisture can be removed by a chemical method through a hygroscopic agent and an oxygen purification furnace.
It is known from a large number of experiments that the water factor interference mainly comes from oxygen, and in more serious cases, the integration time is extended until it cannot be ended. However, after the combustion, the tailing is basically horizontal, so the moisture interference is almost constant for a certain period of time.

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