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As for the technology of producing groundwood-containing papers under alkaline conditions, the main attention now as in the past is focused on interfering substances from groundwood pulp. The terminology "acid to alkaline" itself indicates that chemistry is a primary issue. In general, due to the accumulation tendency of organic anionic trash toward pH increase in the papermaking system, these substances have more detrimental effects on runnability and paper property at alkaline than acid pH. A knowledge of organic anionic trash in paper and papermaking system is of great interest for the paper industry. But current techniques for the determination of fatty and resin acids in pulp and paper matrices are time-consuming and not so precise as are ex-

Studies on wet-end optimization (1). The behavior of organic anionic trash in papermaking system determined by Pyrolysis-Gas Chromatography.