精确的pH监测高度缩的盐水水溶液 (类似海水) 的pH测色传感器阵列
Andrea Pastore1, Denis Badocco1, Luca Cappellin1
1Department of Chemical Sciences, University of Padua, Via Marzolo 1, 35131 Padua, Italy.
ACS sensors
|February 28, 2024
概括
使用化有机原料的新型pH色度传感器阵列 (CSAs) 在高度盐溶液中提供准确的pH测量. 这些可重复使用的传感器为海水应用提供稳定,可靠的读数,性能优于传统的玻璃电极.
科学领域:
- 材料科学 材料科学 材料科学
- 分析化学 分析化学
- 传感器技术 传感器技术
背景情况:
- 由于传统方法的局限性,在海水等高度盐分的环境中精确测量pH值具有挑战性.
- 通常用于pH值的玻璃电极受到干扰,在复杂的矩阵中需要经常重新校准.
- 开发强大可靠的传感器阵列对于有效的环境监测和化学分析至关重要.
研究的目的:
- 开发和表征新的pH色度传感器阵列 (CSAs) 以准确确定缩盐溶液中的pH值.
- 调查化有机原体前体对CSA性能的影响,特别是在海水pH值的背景下.
- 与传统玻璃电极相比,评估开发的CSA的稳定性,可重复使用性和准确性.
主要方法:
- 在纤维素膜上制备CSA,使用有机烯聚合物,含有不同度的化前体和酸指标.
- 制造出四种不同的CSA (D,1F,2F,3F),其化水平不断增加.
- 在海水pH范围 (7.50-8.50) 中对CSA进行校准和测试,并评估它们在不同盐度水平 (20-40) 中的性能.
- 通过使用转换方程和对玻璃电极测量进行验证,将CSA测量与转换为海水尺度 (pHSWS) 的NIST pH值进行比较.
主要成果:
- 含有化有机原体前体的CSA在高度盐水条件下显示出更好的pH测量精度.
- 使用化前体将校准拐点转移到更基本的pH值,优化海水分析.
- CSAs表现出高稳定性,可逆性和可重复使用性,pH预测误差最小 (0.02-0.10pH单位).
- 传感器阵列显示独立于盐度变化在20和40之间,并且适合直接用于真实海水样本.
结论:
- 基于化有机的CSA为高盐度环境中准确和稳定的pH监测提供了玻璃电极的优质替代品.
- 开发的CSA是坚固的,可重复使用的,并且不依赖盐度,因此它们非常适合直接应用于海水.
- 该研究验证了化前体在提高特定环境应用的传感器性能方面的有效性.
相关概念视频
Indicators
48.7K
Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
48.7K
Determining the pH of Salt Solutions
43.6K
The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution. In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than...
43.6K
Concentration Cells
22.6K
A concentration cell is a type of a voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
Consider the following voltaic cell:
Consider the following voltaic cell:
22.6K
Potentiometry: Membrane Electrodes
580
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
580
Potentiometry: Types of Electrodes
650
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
650


