約120年前,Thomas Graham發現将磷酸一鈉加热可生成两种其他物質,他把这两种产物称为焦 NaH_2PO_4→Na_2H_2P_2O_7→NaPO_3 正磷酸盐=单磷酸盐二磷酸盐=焦磷酸盐偏磷酸盐磷酸盐和偏磷酸盐,两者与他称为正磷酸盐的起始物質比較,各有十分不同的性質。几年以后,Maddrell和Fleitmann各自 About 120 years ago, Thomas Graham found that heating two kinds of other substances by heating monosodium phosphate called the coke NaH 2 PO 4 → Na 2 H 2 P 2 O 7 → NaPO 3 orthophosphate = monophosphate diphosphate = pyrophosphate metaphosphate Salt phosphates and metaphosphates, both of which have very different properties compared to what they call orthophosphates. A few years later, Maddrell and Fleitmann each