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関連する概念動画

Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

4.6K
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...
4.6K
Precipitation Gravimetry01:03

Precipitation Gravimetry

13.0K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
13.0K
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

968
For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
968
Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

767
Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
767
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

1.4K
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
1.4K
Precipitation Titration: Overview01:26

Precipitation Titration: Overview

8.9K
Precipitation titration involves the reaction of a titrant and an analyte to generate an insoluble precipitate. While precipitation titration uses various precipitating agents, silver nitrate is the most common precipitating reagent; titrations involving Ag+ are called argentometric titrations. Usually, the endpoint in a precipitation titration can be detected by visual indicators.
A precipitation titration curve demonstrates the change in concentration of the titrant or analyte upon adding the...
8.9K

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関連する実験動画

Updated: Jan 8, 2026

Measuring Nitrite and Nitrate, Metabolites in the Nitric Oxide Pathway, in Biological Materials using the Chemiluminescence Method
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Measuring Nitrite and Nitrate, Metabolites in the Nitric Oxide Pathway, in Biological Materials using the Chemiluminescence Method

Published on: December 25, 2016

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ステップフロー自動分析装置を用いた硝酸塩の迅速かつ精密な測定法：オンラインストップオーバーバナジウム還元

Su-Cheng Pai1, Shun-Kai Chang1, Chia-Te Chien1

  • 1Institute of Oceanography, National Taiwan University, Taipei 106319, Taiwan.

ACS omega
|December 22, 2025
PubMed
まとめ

新しいステップフロー自動分析装置は、バナジウム還元とグリースアッセイを用いて水中の溶存硝酸塩を精密に測定します。この効率的なシステムは、環境分析において高い精度と低い検出限界を提供します。

キーワード:
ステップフロー自動分析装置硝酸塩バナジウム還元グリースアッセイ環境分析

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Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds
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Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

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Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
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Measuring Nitrite and Nitrate, Metabolites in the Nitric Oxide Pathway, in Biological Materials using the Chemiluminescence Method
08:25

Measuring Nitrite and Nitrate, Metabolites in the Nitric Oxide Pathway, in Biological Materials using the Chemiluminescence Method

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Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds
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Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

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Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
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科学分野:

  • 分析化学
  • 環境科学

背景:

  • 溶存硝酸塩の正確な測定は、環境モニタリングにとって非常に重要です。
  • 既存の硝酸塩分析法は、時間がかかったり、精度が不足したりする場合があります。

研究 の 目的:

  • 高精度溶存硝酸塩測定のためのステップフロー自動分析装置を開発・評価すること。
  • 効率向上のために、オンラインバナジウム（III）還元とグリースアッセイを統合すること。

主な方法:

  • 7つのマイクロペリスタルティックポンプと6つの電気リレーモジュールを備えたシステムを利用しました。
  • オンラインバナジウム（III）還元に続いてグリースアッセイを実施しました。
  • フローキュベットを備えた分光光度計を使用して、543 nmでの吸光度を測定しました。

主要な成果:

  • 高い精度（10 μMで<0.5% RSD）と低い検出限界（0.1 μM）を達成しました。
  • 高い還元効率（淡水で約99%、海水で92%）を示しました。
  • 1時間あたり25〜30サンプル、測定サイクル120秒のスループットを実現しました。

結論:

  • 開発されたステップフロー自動分析装置は、精密かつ効率的な溶存硝酸塩測定を提供します。
  • システムの信頼性と性能は、日常的な環境サンプル分析に適しています。
  • オンライン還元とグリースアッセイの統合は、堅牢な分析ソリューションを提供します。