On-line collection/concentration of trace amounts of formaldehyde in air with chromatomembrane cell and its sensitive determination by flow injection technique coupled with spectrophotometric and fluorometric detection

Sritharathikhun, Piyanete; Oshima, Mitsuko; Motomizu, Shoji

doi:10.1016/j.talanta.2005.04.037

Cited by 53 publications

(24 citation statements)

References 50 publications

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“…It is known that heating can improve the sensitivity of the Hantzsch reaction, 21,24 so an electrical heating jacket was constructed for the glass syringe SP2. This syringe SP2 pre-heated a mixture of reagents R1 and R2 stored in the syringe.…”

Section: Syringe Heatermentioning

confidence: 99%

A Multiple Processing Hybrid Flow System for Analysis of Formaldehyde Contamination in Food

et al. 2010

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Experimental Reagents and chemicalsAll chemicals used were of analytical reagent grade. Deionized-distilled water used throughout the work was obtained from an EASYpure II system (Branstead, USA).Ammonium acetate solution (2.0 M) was prepared by This work proposes a flow system suitable for the rapid screening of formaldehyde contaminated in food. The system is based on the concept of a flow analyzer with a Hantzsch reaction. An operating procedure was developed for multiple tasking and high sample throughput. This resulted in a significant sample throughput of 51 samples h -1 . Under the optimized conditions, linear calibration from 10 to 100 μM was obtained. The system gave a limit of detection and a limit of quantitation of 0.06 and 0.10 mg kg -1 , respectively. The system was successfully applied to re-hydrated dry squids, vegetables and mushrooms.

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Section: Syringe Heatermentioning

confidence: 99%

A Multiple Processing Hybrid Flow System for Analysis of Formaldehyde Contamination in Food

et al. 2010

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“…Aqueous liquid is held in micropores and air can pass through macropores. The CMC system has been combined with a flow analysis system to determine HF [36], acid gases and NH 3 [37], NO 2 [38,39], SO 2 [36,40] and HCHO [41]. The advantage of using a CMC system is that low concentrations of gases can be determined with a small volume of air, typically introduced by a syringe into the CMC.…”

Section: Chromatomembrane Cellmentioning

confidence: 99%

Micro gas analyzers for environmental and medical applications

Ohira

Toda

2008

Analytica Chimica Acta

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“…Therefore, these problems make all of them difficult and troublesome or inapplicable in common laboratories [38]. On the other hand, there are some other different methods [43][44][45][46][47] for determining formaldehyde in various samples which one of them is Chromotropic Acid (CA) method that was recommended by the National Institute for Occupational Safety and Health (NIOSH) [36]. Also, it can be utilized for indirect determination of methanol after its oxidation to formaldehyde [42,48], as, it has been recommended as an official method by AOAC (Association of Official Analytical Chemists) for this purpose [49].…”

Section: Introductionmentioning

confidence: 99%

Using an Easy and Fast Modified Chemical Method for Detection of Methanol Content in Drinking Herbal Distillates

Gazani¹,

Shariati²

2017

JAPLR

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Methanol is an essential compound in land plant physiology. Drinking of it can cause poisoning that the most common symptom of it is permanent blindness. A new modified chemical method is needed for detection of methanol in herbal distillates, because all of sophisticated methods for direct determination of methanol require advanced instruments and high technical knowledge which preparing them is very expensive. In this study, a chemical method was modified for detection of methanol content in herbal distillates.For detection and semi determination of methanol level in herbal distillates by the proposed method, 30 different herbal distillate samples were considered. Briefly, 50µL of sulfuric acid and the same amount of potassium permanganate solutions are added into 0.5mL of a 1:1 ratio water diluted sample. After 5 min, examination was continued with adding 50µL of sodium hydrogen sulfite solution, chromotropic acid and 1mL concentrated sulfuric acid, respectively. The appearance of purple color with each intensity would be deduced as positive outcome and the eye comparison of its intensity with color standards is lead to attain semi determined results. The obtained results by the chemical method are confirmed via GC method. According to the results, the presence of methanol in all of examined samples was confirmed.The proposed chemical method is an easy method with suitable sensitivity and accuracy for detection and semi determination of methanol content in herbal distillates and hence, it can be useful to prevention of methanol chronic poisoning by methanol quality control of methanol in these products in mentioned cases.

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On-line collection/concentration of trace amounts of formaldehyde in air with chromatomembrane cell and its sensitive determination by flow injection technique coupled with spectrophotometric and fluorometric detection

Cited by 53 publications

References 50 publications

A Multiple Processing Hybrid Flow System for Analysis of Formaldehyde Contamination in Food

A Multiple Processing Hybrid Flow System for Analysis of Formaldehyde Contamination in Food

Micro gas analyzers for environmental and medical applications

Using an Easy and Fast Modified Chemical Method for Detection of Methanol Content in Drinking Herbal Distillates

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