Junyapoon, Suwannee

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Size Distributions of Inhalable Particulate Matter and Particle-bound Heavy Metals and Their Potential Occupational Health Risk Related to Informal E-waste Recycling in Thailand
(2022-02-08)
Keawhanu, Thidarat
;
Sukonthamut, Sujitra
;
Suriyawong, Achariya
;
Junyapoon, Suwannee
Concentrations and size distributions of atmospheric particulates and particulate-bound heavy metals in different inhalable fractions were studied in working areas during manual dismantling, thermal cutting and cable sheath burning activities. The particulate samples were collected on quartz fiber filters using an eight-stage cascade impactor with flow rate of 28. 3 l min-1. Mass concentrations of the particles were measured in each size fraction. Heavy metals bound on the particles were extracted with acid digestion and then analyzed using Atomic Absorption Spectrophotometer. Risk assessment of worker exposure to the particles was determined. The results indicated that the concentrations of ultrafine (d<inf>ae</inf> < 0.43 μm), fine (0.43 < d<inf>ae</inf> < 2.1 μm) and coarse (2.1 < d<inf>ae</inf> < 10 μm) particles were in the ranges of 14.49-62.04, 57.51-120.26 and 153.26–646.99 μg m−3 during manual dismantling, 363.41-1,011.95, 2,105.40-4,899.11 and 1,698.54-7,075.61 μg m−3 during thermal cutting and 364.73-1,694.72, 1,953.33-4,431.41 and 1,385.97-6,126.13 μg m−3 during cable sheath burning, respectively. The concentrations of PM<inf>2.1</inf> and PM<inf>10</inf> released from these activities did not exceed the OSHA PEL threshold limits. Heavy metals adsorbed on the particles (Fe, Cr, Zn, Cu, Pb, Mn) detected during manual dismantling did not exceed the TWA standard. Concentrations of Cr and Pb during cable sheath burning highly exceeded the standards whereas Pb concentrations during thermal cutting slightly exceeded the standard. The heavy metals released from these recycling activities were more enriched on coarse mode than fine mode. Inhalation exposure to Cr, Pb and Mn posed a potential health risk to the workers.
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Immobilization of Silver Doped Titanium Dioxide onto Stainless Steel Wire Mesh for Photocatalytic Degradation of Gaseous Formaldehyde under Visible Light Irradiation
(2022-03-01)
Sriwong, Chaval
;
Klypoo, Akekarat
;
Khingram, Aiyakub
;
Natluecha, Ratima
;
Junyapoon, Suwannee
Titanium dioxide (TiO<inf>2</inf>) photocatalysis can degrade air pollutants into nontoxic substances but it can only be excited by UV light. To eliminate this limitation, silver (Ag) and/or graphene oxide (GO) doped TiO<inf>2</inf> are applied to enhance visible light photocatalytic activity. In this study, Ag-TiO<inf>2</inf> (0. 5%, 1%, 2% w/w), GO/TiO<inf>2</inf> and GO/Ag-TiO<inf>2</inf> were synthesized and then coated on stainless steel mesh. Crystalline and molecule structures, chemical compositions and optical properties of the prepared photocatalyst samples were characterized with X-ray diffraction spectroscopy, X-ray fluorescence spectroscopy, Raman spectroscopy, UV-visible diffuse reflectance spectroscopy, Fourier-transform infrared spectroscopy, and Scanning electron microscopy equipped with Energy dispersive X-ray spectroscopy techniques. The photocatalytic performances of the various doped catalysts were evaluated according to their abilities to degrade gaseous formaldehyde (HCHO) under visible light. The effect of operational parameters on the photocatalytic degradation of HCHO including layer numbers of photocatalyst, powers of fluorescent lamp and flow rates of HCHO were observed. The results indicated that the presence of Ti, O and Ag elements in Ag-TiO<inf>2</inf> and Ti, O, Ag and C elements in GO/Ag-TiO<inf>2</inf> was confirmed. Proper dispersion of the photocatalyst on the wire mesh was exhibited. Under visible light, the incorporation of Ag and GO in TiO<inf>2</inf> photocatalysts produced higher degradation rates of HCHO than pure TiO<inf>2</inf>. The optimum operating conditions of HCHO degradation at initial concentration of 108.7±1.15 ppm over visible light irradiation for 30 min were 5 layers of 0.5% Ag-TiO<inf>2</inf>, 72 W fluorescent light and 300 ml/ min of HCHO flow rate. Under these conditions, the removal efficiency of gaseous HCHO was 76.70±0.73%.
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Effectiveness of Auricular Acupressure Combined with Medication and Medical Advice for Smoking Cessation
(2024-04-01)
Sivapornpun, Varaporn
;
Eamlaorsuk, Mareeya
;
Junyapoon, Suwannee
Materials and Methods: Two hundred eighty-two patients voluntarily participated in a smoking cessation program at the Smart Quit Clinic, Charoenkrung Pracharak Hospital. The patients were randomly divided into two groups, the treatment group (n=141) receiving specific auricular acupressure and the control group (n=141) receiving non-specific auricular acupressure. Five specific auricular acupressure points, including shenmen, lung, mouth, stomach, and sympathetic, were used to treat NWS. Each point was pressed with Wang Bu Liu Xing for one minute. The acupressure was applied three times a day for 12 weeks. The succession of cessation was assessed using carbon monoxide (CO) levels in exhaled breath and relief of NWS.Objective: Nicotine withdrawal symptoms (NWS) are the main impediments to the quitting attempt. The present study investigated the effectiveness of specific auricular acupressure combined with medication and medical advice to quit smoking.Results: The success of smoking cessation in the treatment group was significantly higher than the control group after cessation at weeks 12 and 24. Specific auricular acupressure such as shenmen, lung, mouth, stomach, and sympathetic, could reduce anxiety, craving on smoking, insomnia, and nervous symptoms since the first week after cessation.Conclusion: Specific auricular acupressure using Wang Bu Liu Xing is an effective and safe treatment method for relieving NWS.

Junyapoon, Suwannee

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