土壤中出现有结晶和非结晶形式的铁和铝的氢氧化物。
Iron and aluminum hydroxides are present in soils in both crystalline and amorphous forms.
试验证明：碱金属碳酸盐，碱金属氢氧化物和碳酸钠同四氧化三铁的复合剂，都表现出相接近的催化活性。
The test demonstrates that alkali carbonates, alkali hydroxides and a combination of sodium carbonate with ferriferrous oxide all exhibit approximate catalytic activity.
结果表明：宁村瓷石主要由长英质矿物组成，铁元素主要以硅酸盐矿物，硫化物和氧化物及氢氧化物等形式存在；
The results of composition analyses show that Ningcun china stone is mainly composed of quartz, sericite and feldspar; iron is contained in silicate, sulphide, oxide and hydroxide minerals.
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