An easy spectrophotometric acid-base titration protocol for dissolved organic matter

Tesfa, Marawit; Dia, Aline; OLLIVIER, Malou; Osorio-Leon, Ivan; Marsac, Rémi

doi:10.1016/j.mex.2022.101721

Cited by 3 publications

(12 citation statements)

References 12 publications

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“…The specific UV absorbance spectra, here denoted as “ A λ,pH ” (in cm –1 gC –1 L) for simplicity, is commonly referred to as “SUVA” in the literature. The specific absorbance spectra, above 540 nm, contain little information, and as demonstrated in a previous study, the absorbance of the pure buffer solutions is limited to λ < 240 nm. Consequently, all data treatments were conducted within a λ range of 240–540 nm.…”

Section: Methodsmentioning

confidence: 84%

“…The preparation of the buffer solutions followed the protocol described in a previous article . Briefly, buffer salt was dispersed in a total of 50 mL volume of ultrapure water at a final concentration of 1 mol L –1 .…”

Section: Methodsmentioning

confidence: 99%

“…Spectrophotometric acid–base titration was also carried out as described in a previous study . Each of the studied NOM samples was divided into 13 aliquots of 4 mL (25 mgC L –1 and 0.01 mol L –1 NaCl).…”

Section: Methodsmentioning

confidence: 99%

“…More recently, the NOM acid–base properties were determined using UV spectrophotometry, a method requiring lower NOM concentrations similar to natural conditions. − In addition, this approach is a simple, rapid, and low-cost analysis of the NOM acid–base properties. It is based on the observation that the UV–vis absorption of a dissolved NOM sample increases with increasing pH.…”

Section: Introductionmentioning

confidence: 99%

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Estimating the Acid–Base Properties and Electrical Charge of Organic Matter Using Spectrophotometry

Tesfa,

Dia,

Mahé

et al. 2023

Environ. Sci. Technol.

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Spectrophotometric acid–base titration is a simple and powerful technique to evaluate the properties of proton binding sites of natural organic matter (NOM) at environmentally relevant concentrations. However, it is challenging to quantify the chemical charges (Q) carried by NOM at these concentrations. Based on a previous work, which relates the variation of Q with the specific UV–vis differential absorbance (ΔA λ,pH) at a given wavelength (λ) and pH of a dissolved NOM sample, the present work proposes a method to investigate any NOM sample. It determines specific features in the absorbance spectra attributed to proton-inert chromophores (A 0,λ) and to the deprotonation processes of carboxylic (A 1,λ) and phenolic groups (A 2,λ). It enables to select sample-specific wavelength (λmid), where both these functional groups significantly contribute to the variation of absorbance with pH. The linear regression analysis of A λmid,pH vs Q for various NOM reference samples evidenced that the sample-specific slope (S NOM) and intercept (I NOM) were related to the intrinsic spectroscopic properties of the sample (A 0,λmid, A 1,λmid, and A 2,λmid). This approach can thus be used to approximate the Q values of the NOM samples at environmentally relevant concentrations: a pre-requisite for predicting the fate and behavior of metal ions in natural systems.

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Section: Methodsmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Estimating the Acid–Base Properties and Electrical Charge of Organic Matter Using Spectrophotometry

Tesfa,

Dia,

Mahé

et al. 2023

Environ. Sci. Technol.

Self Cite

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“…[12][13][14][15] The use of spectrophotometer is a viable option for detecting color endpoints through absorbance measurement. 16,17 Despite its high accuracy and relatively low detection limits, this technique is considered expensive and cumbersome. In recent years, Digital Image Colorimetry (DIC) has become increasingly popular for detecting color changes in chemical analysis.…”

Section: Introductionmentioning

confidence: 99%

A low-cost automated titration system for colorimetric endpoint detection

Boppana

Snow

Simone

et al. 2023

Analyst

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A Mini Review of Natural Cellulosic Fibers: Extraction, Treatment and Characterization Methods

Kaushik

Keawsawasvong

Sooriyaperakasam

et al. 2023

JCMM

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Natural cellulosic fibers have garnered significant attention in recent years due to their potential as eco-friendly and sustainable alternatives to synthetic materials in various industries, such as composite reinforcement, textiles, and packaging. The successful utilization of these fibers depends on understanding their properties, which can be achieved through comprehensive characterization methods. This mini-review discusses the extraction, treatment, and characterization of natural cellulosic fibers, focusing on the latest advancements in these areas. The extraction methods of natural cellulosic fibers, including chemical, physical, and biological processes, are discussed. The choice of extraction method impacts the fiber’s morphology, crystallinity, and purity, which ultimately affects its performance in different applications. Surface modification methods, including chemical treatments like treatment, acetylation, silane treatment, grafting, bleaching, and physical treatments such as corona treatment, plasma treatment, and UV/ozone treatment, are also explored. These treatments can enhance the compatibility and performance of natural cellulosic fibers in various applications. Characterization techniques for natural cellulosic fibers are reviewed, including mechanical properties testing (tensile strength, flexural strength, and impact strength), morphological analysis (scanning electron microscopy (SEM) and transmission electron microscopy (TEM)), and advanced techniques such as atomic force microscopy (AFM), confocal Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). Furthermore, the application of the Weibull distribution for analyzing the tensile strength of natural cellulosic fibers is discussed, providing valuable information on the fiber’s strength distribution and reliability. This review highlights the importance of comprehensive characterization methods in understanding the properties and potential applications of natural cellulosic fibers. The continued development of these techniques will be crucial for the advancement and commercialization of these sustainable materials as eco-friendly alternatives to traditional materials in a wide range of industries.

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An easy spectrophotometric acid-base titration protocol for dissolved organic matter

Cited by 3 publications

References 12 publications

Estimating the Acid–Base Properties and Electrical Charge of Organic Matter Using Spectrophotometry

Estimating the Acid–Base Properties and Electrical Charge of Organic Matter Using Spectrophotometry

A low-cost automated titration system for colorimetric endpoint detection

A Mini Review of Natural Cellulosic Fibers: Extraction, Treatment and Characterization Methods

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