As specific examples of pH adjusting agents, hydroxides such as lithium hydroxide, sodium hydroxide, potassium hydroxide and ammonium hydroxide; acids such as sulfuric acid, hydrochloric acid and acetic acid; sulfates such as lithium sulfate, sodium sulfate, potassium sulfate and ammonium sulfate; carbonates such as lithium carbonate, sodium carbonate, sodium hydrogencarbonate, potassium carbonate