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Updated: Jun 18, 2026

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在装水果样本中的锡的光谱光度测定,使用sappan木材提取物作为天然试剂

Napaporn Bunnaranurak1, Napa Tangtreamjitmun1

  • 1Department of Chemistry, Faculty of Science, Burapha University, Chonburi 20131, Thailand.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
|March 10, 2026
PubMed
概括

一种新的绿色光谱测量方法使用sappan木材提取物 (brazilein) 来检测装水果中的有毒锡. 这种环保的方法比传统方法提供了较低的检测极限和更广泛的线性范围.

关键词:
在巴西,巴西人.粮食安全 粮食安全绿色分析化学 绿色分析化学自然资源是自然资源,自然资源就是自然资源.的提取物 的提取物

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Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...