Accuracy Spectrophotometric Determination of pH for Sea Water

准确分光光度法测定海水 pH 值

• 批准号: 05640555
• 负责人: YAMAZAKI Hideo
• 金额: $ 1.34万
• 依托单位: Kinki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640555/
• 关键词: pH; Sea Water; pH Indicator; Spectrophotometric Method; Hydrogen Ion Concentration; 分光測光法; pH測定; 分光光度法

The pH of sea water was accurately determined from spectrophotometric measurement. The measurement of pH of the analyte solution was achieved by the spectrophotometric method using thymol blue as a pH indicator. Advantage was taken of the redundant data available with digitized spectra. The calculations of pH and its statistical errors were performed using the spreadsheet software. Statistically photometric errors of the pH measurement of sea water was estimated to be <plus-minus>0.00015 pH units. Because of limited by errors in the K_a evaluation of thymol blue, the overall accuracy of this method was <plus-minus>0.00072 pH at 25ﾟC,and salinities between 0 to 40 *. One aspect of pH measurement often ignored is the low reliability of glass electrode pH reading at high ionic strength sample. The use of spectral method can circumvent some of the difficulties. Accurate and reliable determination of the pH of sea water is necessary for the reveal of chemical process in the ocean. Currently, I am extending this approach to development of a new optical pH sensor.

用分光光度法准确测定海水的pH值。用百里酚蓝作pH指示剂，用分光光度法测定分析物溶液的pH值。利用了数字化光谱的冗余数据。使用电子表格软件计算pH值及其统计误差。海水pH测量的光度误差估计为<plus-minus>0.00015 pH单位。由于受麝香草酚蓝K_a值测定误差的限制，在25 ℃，盐度0 ~ 40 × 10 ~（-1）范围内，该方法的总准确度为<plus-minus>0.00072。pH测量的一个经常被忽视的方面是在高离子强度样品下玻璃电极pH阅读的低可靠性。谱方法的使用可以规避某些困难。准确可靠地测定海水pH值是揭示海洋化学过程的必要条件。目前，我正在扩展这种方法，以开发一种新的光学pH传感器。

项目成果

山崎秀夫: "分光測光法による新しい水素イオン濃度(pH)測定法の開発" 放射線科学. (印刷中).

Hideo Yamazaki：“开发一种使用分光光度法测量氢离子浓度 (pH) 的新方法”《放射科学》（正在出版）。

Hideo Yamazaki: "Development of New Method for Hydrogen concentration (pH) Measurements by Spectrophotometry (in Japanese)" Radiological Sciences. (in press).

Hideo Yamazaki：“开发分光光度法测量氢浓度 (pH) 的新方法（日语）”放射科学。

Hideo Yamazaki: "Spectrophotometric determination of the dissociation constant(pKa) of arsenous acid" Analytica Chimica Acta. 284. 379-384 (1993)

Hideo Yamazaki：“亚砷酸解离常数（pKa）的分光光度测定”《分析化学学报》。

Hideo Yamazaki: "Spectrophotometric determination of the dissociation constant(pKa)of arsenous acid" Analytica Chimica Acta. (印刷中).

Hideo Yamazaki：“亚砷酸解离常数 (pKa) 的分光光度测定”Analytica Chimica Acta（出版中）。

Hideo Yamazaki: "Spectrophotometric determination of the dissociation constant (pKa) of arsenous acid" Analytica Chimica Acta. 284. 379-384 (1993)

Hideo Yamazaki：“亚砷酸解离常数 (pKa) 的分光光度测定”Analytica Chimica Acta。