Examples of suitable salts include ammonium, alkali metal salts, particularly sodium and potassium, alkaline earth metal salts such as calcium and magnesium, and salts with suitable organic bases such as lower alkylamines (methylamine, ethylamine, cyclohexylamine, and the like) or with substituted lower alkylamines (e.g. hydroxyl-substituted alkylamines such as diethanolamine, triethanolamine or t