trivalent metal ion 三价金属离子
trivalent erbium ion 三价铒离子
trivalent basic ion 三价阳离子
trivalent complex ion 三价铬离子
trivalent chromium ion 三价铬离子
trivalent europium ion 三价铕离子
trivalent dysprosium ion 三价镝离子
It was studied that the graphite-based lead dioxide anode which had been electrochemically activated was used to electrogenerate trivalent cobalt ion by means of coulometry at ambient temperature.
以库仑分析法为研究手段，考察了在室温下经电化学活化的石墨基二氧化铅阳极电生三价钴的条件及其应用。
Hexavalent chrome is reduced to trivalent chrome by morpholine under high temperature conditions. Then morpholine content is calculated by detecting the absorbance of trivalent chromic ion.
吗啉在高温下将六价铬还原为三价铬，通过测定三价铬离子的吸光度，计算出锅炉给水中吗啉含量。
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