Treatment of complex sulfur-containing solutions in ammonia desulfurization ammonium sulfate production by ultrasonic-assisted ozone technology.

In this work, the cause of abnormal color in ammonium sulfate products formed by flue gas desulfurization is revealed by investigating the conversion relationship between different sulfur-containing ions and their behavior in a sulfuric acid medium. Both thiosulfate (SO) and sulfite (SO ＆ HSO) impurities affect the quality of ammonium sulfate. The SO is the main reason for the yellowing of the product due to the formation of sulfur impurities in concentrated sulfuric acid.

[Study on the prevalence and risk factors of "subhealth" status in college and university staff in Guangdong province].

Objective: To understand the current status and risk factors of "subhealth" in college and university staff in Guangdong province.

Methods: Eight thousand four hundred and seventeen staff in 19 colleges and universities in Guangdong were investigated through a self-developed questionnaire, and statistically analyzed using chi(2) test, chi(2)(strand) test and odd ratio. Judgement was based on the criteria on "subhealth" through Delphi method.