Near-infrared spectroscopy for the quantitative determination of mass transfer and water absorption kinetics by a polymer solution

2010 ◽  
Vol 48 (18) ◽  
pp. 1960-1969 ◽  
Author(s):  
Céline Pochat-Bohatier ◽  
Warit Werapun ◽  
Denis Bouyer ◽  
Watchanida Chinpa ◽  
André Deratani
Keyword(s):  
Mass Transfer ◽  
Infrared Spectroscopy ◽  
Quantitative Determination ◽  
Water Absorption ◽  
Polymer Solution ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Absorption Kinetics

Influence of data pre-processing on the quantitative determination of the ash content and lipids in roasted coffee by near infrared spectroscopy

2004 ◽  
Vol 509 (2) ◽  
pp. 217-227 ◽  
Author(s):  
Consuelo Pizarro ◽  
Isabel Esteban-Dı́ez ◽  
Antonio-José Nistal ◽  
José-Marı́a González-Sáiz
Keyword(s):  
Infrared Spectroscopy ◽  
Quantitative Determination ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Ash Content ◽  
Roasted Coffee

scholarly journals Quantitative Determination of Fluorine Content in Blends of Polylactide (PLA)–Talc Using Near Infrared Spectroscopy

Sensors ◽  
2016 ◽  
Vol 16 (8) ◽  
pp. 1216 ◽  
Author(s):  
Elena Tamburini ◽  
Chiara Tagliati ◽  
Tiziano Bonato ◽  
Stefania Costa ◽  
Chiara Scapoli ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Quantitative Determination ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Fluorine Content

scholarly journals Quantitative Determination of Calcium Hydroxide by Using Near-Infrared Spectroscopy

2018 ◽  
Vol 765 ◽  
pp. 300-304
Author(s):  
Tanyapa Sangpongpitthaya ◽  
Alfred A. Christy ◽  
Rein Terje Thorstensen
Keyword(s):  
Infrared Spectroscopy ◽  
Quantitative Determination ◽  
Calcium Hydroxide ◽  
Near Infrared Spectroscopy ◽  
Calcium Silicate ◽  
Near Infrared ◽  
Concrete Structures ◽  
Steel Structures ◽  
Hydration Reaction

Calcium hydroxide (CH) is a by-product from hydration reaction of cement along with calcium silicate hydrate (C-S-H) gel. It helps to protect the steel reinforcements in concrete structures from corrosion process due to carbonation. The presence of calcium hydroxide provides a basic environment (pH˃10) that induces the formation of passive oxide film and keeps steel structures from corrosion. The detection and quantification of calcium hydroxide in concrete structures are important to understand the nature and state of the steel structures in concretes. In this research work, the variation of calcium hydroxide to calcium silicate ratios in cement were measured by using near-infrared spectroscopy (NIR). The first overtone of the OH groups in calcium hydroxide absorbs at 7082 cm-1and this absorption peak can be used as a quantitative measure of calcium hydroxide in samples. Correlation plot between second derivative absorbance intensity at 7082 cm-1with different mixtures of calcium hydroxide in calcium silicate base. The amount of calcium hydroxide in calcium silicate base was established. This calibration plot was used as basis for determining calcium hydroxide content in unknown concrete samples. Concrete samples for the quantitative determination of calcium hydroxide were prepared from standard cement samples and cement samples with or without pozzolan along with various water to cement ratios. The results show that all samples analyzed in this work contain calcium hydroxide in varying amounts. This variation reflects the composition of the cement and concrete samples.

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