Alkalinity (สภาพด างและ สภาพด าง
5. ค า pheolphthalein alkalinity (P) และ total alkalinity (T) มีความส ัมพันธ กันรูปต าง ๆ ของ alkalinity ดังแสดงในตารางท ี่ 1 6. มี carbonate alkalinity ถ า P ไม เท ากับ 0 แต น อยกว า T 7.
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