caustics were acid in 41.5%, mainly hydrochloric acid, with a average pH of 2.76 ± 2.10; 26.8% caustics found were base, mainly sodium hydroxide and potassium hydroxide, with average pH of 12.74 ± 1.91.
CAM là acid gặp ở 41,5%, chủ yếu là acid HCl, với pH trung bình là 2,76 ± 2,10; bazơ gặp ở 26,8%, chủ yếu là NaOH và KOH, với pH trung bình là 12,74 ± 1,91.