USE OF GAMMA-(4-NITROBENZYL)PYRIDINE AS ANALYTICAL REAGENT FOR ETHYLENIMINES AND ALKYLATING AGENTS
USE OF GAMMA-(4-NITROBENZYL)PYRIDINE AS ANALYTICAL REAGENT FOR ETHYLENIMINES AND ALKYLATING AGENTS
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DOI：
10.1021/ac60105a022
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发表时间：
1955-01-01
影响因子：
7.4
通讯作者：
ESS, RJ
中科院分区：
文献类型：
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作者：
EPSTEIN, J;ROSENTHAL, RW;ESS, RJ
在没有还原剂的情况下，氧化铁矿物（例如赤铁矿或褐铁矿）不会干扰所提出的方法。有时，除黄铁矿或菱铁矿之外的二价铁矿物也会作为脉石材料少量出现在白钨矿中。它们通常是硅酸盐，主要是石榴石，其中部分可溶性铁呈氧化形式，或者通过 400°C 的焙烧程序很容易被氧化。这种疑似含有 2% 黑钨矿的石榴石是通过与纽约格伦科夫的华昌冶炼和精炼公司合作从高级白钨精矿（73% 氧化钨）的弱磁性部分中获得的，该精矿是通过实验室磁力分离器。使用氢氟硫酸-高锰酸盐滴定法发现部分铁[1.42%铁(II)]呈亚铁态(4)。然而，在焙烧后，使用所提出的方法，铁 (II) 含量下降至 0.38%，表明存在 0.38 X 5.44= 2.07% 的铁碱体。额外的测试表明，当向白钨矿中添加少量钛铁矿和铌铁矿时，没有错误。
Oxidized iron minerals—such as hematite or limonite—do not interfere with the proposed method in the absence of reducing agents. Occasionally, ferrous-iron minerals other than pyrite or siderite, occur in small quantities in scheelite as gangue material. They are usually silicates, mainly garnets, with either part of the soluble iron in the oxidized form or easily oxidizable by the roasting procedure at 400 C. Such a garnet suspected to contain 2% of wolframite was obtained through the cooperation of the Wah Chang Smelting and Refining Co., Glen Cove, NY, from the weakly magnetic fraction of a high-grade scheelite con-centrate (73% tungstic oxide) which was passed through a laboratory magnetic separator. Part of the iron [1.42% iron (II)] was found tobe in the ferrous state using the hydrofluoricsulfuric acid-permanganate titration method (4). However, after roasting, the iron (II) content dropped to 0.38% using the proposed method, indicating the presence of 0.38 X 5.44= 2.07% of ferberite. Additional tests indicated no errors when small amounts of ilmenite and columbite were added to scheelite.