Multi-wavelength spectrophotometric determination of pH using phenol red-doped sol-gel film sensors

doi:10.1080/00387010.2017.1321019

	Multi-wavelength spectrophotometric determination of pH using phenol red-doped sol-gel film sensors
	Wang, Hongliang; Liu, Baohua; Li, Zhengguang; Yang, Lei
刊名	SPECTROSCOPY LETTERS
	2017
卷号	50 期号:6 页码:307-315
关键词	Multi-wavelength method phenol red pH optical sensor sol-gel
ISSN号	0038-7010
DOI	10.1080/00387010.2017.1321019
英文摘要	Dye leakage and the nonlinear relationship between absorbance and pH affect the pH measurement precision of absorption-based optic sensors and limit their application. Based on the preparation of a transparent sol-gel thin film with a phenol red indicator, this work assumed that the absorbancies had an exponential relationship to the concentrations of the indicator, and the multi-wavelength equation for the pH was derived as follows: where n is the exponential coefficient, e(1), e(2), and e(3) are the extinction coefficient ratios, and R is the ratio of the absorbancies. The calculation parameters for an immobilized phenol red film were pK(a)=8.577, e(1)=0.0191, e(2)=1.530, e(3)=0.2992, and n=0.6322, while those for an immobilized phenol red/Triton X-100 film were pK(a)=8.612, e(1)=0.0507, e(2)=1.501, e(3)=0.3687, and n=0.3931. The correspondence between the calculated pK(a) and the pK(a) from the calibration curve verifies the equation. The calculation parameters remain stable as the indicator content is increased, but change with an increase in the Triton X-100 content. Using the equation, the calculated pH shows stable behavior over a long duration regardless of dye leakage, and the calculated precision is 0.0053. The method provides drift-free and precise water pH measurements for R that is not dependent on the total concentration of the indicator, and can be applied to online monitoring.
资助项目	Taishan Scholar Project Funding of China[tspd20161007]
WOS研究方向	Spectroscopy
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000404931300003
内容类型	期刊论文
源URL	[http://ir.fio.com.cn/handle/2SI8HI0U/3290]
专题	自然资源部第一海洋研究所
作者单位	State Ocean Adm, Natl Deep Sea Ctr, Qingdao 266237, Peoples R China
推荐引用方式 GB/T 7714	Wang, Hongliang,Liu, Baohua,Li, Zhengguang,et al. Multi-wavelength spectrophotometric determination of pH using phenol red-doped sol-gel film sensors[J]. SPECTROSCOPY LETTERS,2017,50(6):307-315.
APA	Wang, Hongliang,Liu, Baohua,Li, Zhengguang,&Yang, Lei.(2017).Multi-wavelength spectrophotometric determination of pH using phenol red-doped sol-gel film sensors.SPECTROSCOPY LETTERS,50(6),307-315.
MLA	Wang, Hongliang,et al."Multi-wavelength spectrophotometric determination of pH using phenol red-doped sol-gel film sensors".SPECTROSCOPY LETTERS 50.6(2017):307-315.