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Masking and Demasking Agents01:19

Masking and Demasking Agents

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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

350
Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a...
350
Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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提升法医准确性:减轻死后一氧化碳分析中的甲血球干扰,使用二酸盐减少方法.

Miyeon Lee1, Doyeon Lee2, Young-Hoon Jo3

  • 1Daejeon District Office, National Forensic Service, Daejeon, 34054, Republic of Korea. leemiyeon0701@korea.kr.

Scientific reports
|July 22, 2025
PubMed
概括

二酸盐的处理减少了脏组织中一氧化碳 (CO) 的过高估计. 这种方法提高了死后的CO量化准确性,特别是在含有分解的甲血球蛋白 (MetHb) 的样本中.

关键词:
一氧化碳的一氧化碳.碳氧血球蛋白是一种碳氧血球蛋白.在 GC GC 中.在死后进行尸检.减少剂是减少剂.脏 脏是指脏的部分.

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科学领域:

  • 法医毒理学 法医毒理学
  • 生物化学 生物化学
  • 分析化学 分析化学

背景情况:

  • 准确的死后一氧化碳 (CO) 分析至关重要.
  • 在分解过程中形成甲基红蛋白 (MetHb) 可以抑制CO结合,导致不准确的结果.
  • 降解剂可以将MetHb转化回血红蛋白 (HHb).

研究的目的:

  • 为了研究二尼酸 (一种减少剂) 对脏组织中CO分析的影响.
  • 为了确定MetHb是否会影响死后样本中的CO量化.
  • 为了提高死后CO测量的准确性.

主要方法:

  • 从60个尸体解剖案例中取出的脏样本被分为控制组和减少组.
  • 减少的样本用0.574M二酸盐 (Na2S2O4) 进行处理.
  • 两组都使用热导电探测器 (GC-TCD) 的气体染色学进行了分析.

主要成果:

  • 48个病例在缩小样本中显示出明显较低的CO水平 (中位数差异为13.83%).
  • 在12个案例中,差异很小 (平均差异为0.67%).
  • 在分解过程中形成MetHb被证实可以抑制CO结合.

结论:

  • MetHb显著干扰了脏组织中死后的CO量化.
  • 二酸盐治疗纠正了MetHb的抑制,提高了准确性.
  • 这种方法对于可靠的死后CO分析至关重要,特别是在腐烂的样本中.