在海水样本中确定As,Cu和Pb的新方法,使用氧化八面体分子作为分散固相微提取吸收剂
Marina Araujo J Lopes da Costa1, Mariana F Costa2, Rayane Sorrentino3
1Rio de Janeiro State University, Graduate Program in Chemical Engineering, Rua Sāo Francisco Xavier 524 - Maracanā, Rio de Janeiro, RJ, 20550-013, Brazil.
Talanta
|October 27, 2023
概括
本研究提出了一种新方法,用于检测海水中的 (As),铜 (Cu) 和 (Pb),使用氧化 (OMS-2) 作为吸附剂. 优化的技术提高了这些重金属的检测极限.
科学领域:
- 环境化学环境化学
- 分析化学 分析化学
- 材料科学 材料科学 材料科学
背景情况:
- 海水中的重金属污染对环境和健康构成重大风险.
- 准确而敏感的检测方法对于监测海洋污染至关重要.
- 预缩技术通常是必要的,以达到微量元素的低检测极限.
研究的目的:
- 开发和优化一种用于从海水中预先缩 (As),铜 (Cu) 和 (Pb) 的新方法.
- 为了利用氧化八面体分子 (OMS-2) 作为有效的吸收材料.
- 为了确定预度和诱导合等离子体光学发射光谱 (ICP-OES) 分析的最佳条件.
主要方法:
- 氧化八面体分子网 (OMS-2) 纳米材料的合成和表征.
- 使用中央复合设计优化ICP-OES操作条件.
- 优化吸附过程参数 (pH,吸附剂剂量,时间).
- 使用开发的预缩方法与ICP-OES相结合,对海水样本进行分析.
主要成果:
- 最佳的ICP-OES条件:1200W的射频功率,0.7L分钟-1的雾化气体流量.
- 最佳吸附条件:pH6.5,30毫克OMS-2,时间35分钟.
- 实现了66 (As),45 (Cu) 和21 (Pb) 的丰富系数.
- 获得的检测极限:0.3微克L-1 (As),0.1微克L-1 (Cu) 和2.1微克L-1 (Pb).
- 恢复率在80%至120%之间.
结论:
- 使用OMS-2进行预度的新方法有效地确定海水中的As,Cu和Pb.
- 优化的方法为复杂矩阵中微量金属分析提供了良好的灵敏度和准确性.
- 这种方法为监测海洋环境中的重金属污染提供了可行的解决方案.
相关概念视频
Precipitation and Co-precipitation
1.8K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.8K
Extraction: Advanced Methods
463
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
463
Precipitation of Ions
27.9K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
27.9K
Qualitative Analysis
22.4K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
22.4K
Gravimetry: Inorganic And Organic Precipitating Agents
1.3K
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
1.3K


