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Effects of CO_2 on Spray Solution pH

机译：CO_2对喷雾溶液pH值的影响

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摘要

The pH of deionized water, initially adjusted to a pH of 6 to 9, all decreased to near pH 5 upon pressurization with CO_2 in a backpack spray system. When deionized water contained bicarbonate (NaHCO_3 or KHCO_3) at 0 to 800 mg/L to buffer against a pH decrease from CO_2 pressurization the return to their initial pH was more rapid than deionized water alone regardless of bicarbonate source. Acidification of spray solution following CO_2 pressurization of 138, 276, or 414 kPa was similar and bicarbonate had a greater effect than spray pressure. Addition of acidifying buffer and bicarbonate to the solution resulted in an initial and post-CO_2 pressurization pH range of less than one pH unit. All spray solution pH levels returned to near their initial pH following depressurization, indicating that the pH decrease was not permanent. Rate of recovery from acidification with CO_2 increased with initial pH and bicarbonate concentration.
机译：在背包喷雾系统中用CO_2加压后，最初调整为6至9的去离子水的pH均降低至接近pH 5。当去离子水包含0至800 mg / L的碳酸氢盐（NaHCO_3或KHCO_3）以缓冲因CO_2加压而导致的pH降低时，无论碳酸氢盐来源如何，比单独使用去离子水更快地恢复其初始pH。 138、276或414 kPa的CO_2加压后，喷雾溶液的酸化作用相似，碳酸氢盐的作用大于喷雾压力。向溶液中添加酸化缓冲液和碳酸氢盐导致初始和后CO_2加压pH范围小于一个pH单位。降压后，所有喷雾溶液的pH值均恢复到接近其初始pH值，表明pH值降低不是永久性的。用CO_2酸化的回收率随初始pH和碳酸氢盐浓度的增加而增加。

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