Mrasurement of Atmospheric Formaldehyde Using a Drop Collector and In-Situ Colorimetry

Micro gas analyzers for environmental and medical applications

“…In both of these, an analyte gas comes into direct contact with the collection medium that has a large surface to volume ratio and is easily renewable. Dasgupta's group developed analysis systems with a droplet/film-based collector/reactor for analysis of SO 2 [4], NH 3 [4,5], Cl 2 [6], H 2 O 2 [7], H 2 S [8], atmospheric HCHO [9] and formic and acetic acids [10]. An absorbing solution was made to flow by electroosmosis, the use of syringe pump, or just gravity.…”

Amônia (NH3) atmosférica: fontes, transformação, sorvedouros e métodos de análise

“…Levando-se em conta que a amônia é facilmente incorporada a gotículas de água foi montado, no nosso laboratório, um sistema colorimétrico para análise de amônia gasosa 116 , seguindo o mesmo princípio de métodos baseados em gotas pendentes desenvolvidos anteriormente [117][118][119][120] . Para isto, um sistema de formação de gotas contendo água desionizada para coletar amônia foi acoplado a um conjunto de fibras ópticas e fotodiodos.…”

A Flow-Injection Chemiluminescence Determination of Formaldehyde in Textiles

“…[18] The MBTH method has been less commonly used because it is very expensive and can react easily with other aldehydes, and the sample solutions should be measured immediately after sampling due to the instability of the MBTH-formaldehyde intermediate. [19,20] Chemiluminescence (CL) methods for the determination of formaldehyde in natural and wastewater based on the Trautz-Schorigin reaction involving formaldehyde, hydrogen peroxide, and gallic acid in a strong alkaline solution was developed by Slawinska and Slawinska. [21] Afterwards, Motyaka and coworkers [22,23] modified the original configuration of the Trautz-Schorigin reaction into a form suitable for flow-injection analysis (FIA) of formaldehyde in water samples.…”