Browsing by Author "Sushera Bunluesin"

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    Batch and continuous packed column studies of cadmium biosorption by Hydrilla verticillata biomass
    (2007-06-01) Sushera Bunluesin; Maleeya Kruatrachue; Prayad Pokethitiyook; Suchart Upatham; Guy R. Lanza; Mahidol University; Burapha University; University of Massachusetts
    The removal of heavy metal ions by the nonliving biomass of aquatic macrophytes was studied. We investigated Cd biosorption by dry Hydrilla verticillata biomass. Data obtained in batch experiments indicate that H. verticillata is an excellent biosorbent for Cd. Cd was rapidly adsorbed and such adsorption reached equilibrium within 20 min. The initial pH of the solution affected Cd sorption efficiency. Results obtained from the other batch experiments conformed well to those obtained using the Langmuir model. The maximum adsorption capacity qmaxfor H. verticillata was 15.0 mg/g for Cd. The breakthrough curve from the continuous flow studies shows that H. verticillata in the fixed-bed column is capable of decreasing Cd concentration from 10 to a value below the detection limit of 0.02 mg/l. The presence of Zn ions affected Cd biosorption. It can be concluded that H. verticillata is a good biosorbent for treating wastewater with a low concentration of Cd contaminants. © 2007 The Society for Biotechnology, Japan.
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    Estimated dietary sodium intake in Thailand: A nationwide population survey with 24-hour urine collections
    (2021-04-01) Worawon Chailimpamontree; Surasak Kantachuvesiri; Wichai Aekplakorn; Raweewan Lappichetpaiboon; Nintita Sripaiboonkij Thokanit; Prin Vathesatogkit; Ananthaya Kunjang; Natthida Boonyagarn; Penmat Sukhonthachit; Narinphop Chuaykarn; Patthrapon Sonkhammee; Payong Khunsaard; Phassakon Nuntapanich; Pattaraporn Charoenbut; Comsun Thongchai; Apinya Uttarachai; Wisrut Kwankhoom; Fuangfah Rattanakanahutanon; Krich Ruangchai; Nadchar Yanti; Natnapa Sasang; Sushera Bunluesin; Renu Garg; Ramathibodi Hospital; Songkhla Rajabhat University; Phranakhon Si Ayutthaya Rajabhat University; Ubon Ratchathani Rajabhat University; Rajamangala University of Technology Srivijaya; World Health Organization, Thailand; Valaya Alongkorn Rajabhat University; Faculty of Medicine Ramathibodi Hospital, Mahidol University; Thailand Ministry of Public Health; Fort Nawamintharachini Hospital; Chandrubeksa hospital; Nephrology Society of Thailand; Chiang Rai College
    Thailand has committed to reducing population sodium intake by 30% by 2025. However, reliable nationally representative data are unavailable for monitoring progress toward the goal. We estimated dietary sodium consumption using 24-hour urinary analyses in a nationally representative, cross-sectional population-based survey. We selected 2388 adults (aged ≥ 18 years) from the North, South, North-east, Central Regions, and Bangkok, using multi-stage cluster sampling. Mean sodium excretion was inflated by 10% to adjust for non-urinary sources. Multivariate logistic regression was performed to assess factors associated with sodium consumption ≥ 2000 mg. Among 1599 (67%) who completed urine collection, mean age was 43 years, 53% were female, and 30% had hypertension. Mean dietary sodium intake (mg/day) was 3636 (±1722), highest in South (4108 ± 1677), and lowest in North-east (3316 ± 1608). Higher sodium consumption was independently associated with younger age (Adjusted Odds Ratio (AOR) 2.81; 95% Confidence interval (CI): 1.53-5.17; p =.001); higher education (AOR 1.79; 95% CI: 1.19-2.67; p =.005), BMI ≥ 25 (AOR 1.55; 95% CI: 1.09-2.21; p=.016), and hypertension (AOR 1.58; 95% CI: 1.02-2.44; p =.038). Urine potassium excretion was 1221 mg/day with little variation across Regions. Estimated dietary sodium consumption in Thai adults is nearly twice as high as recommended levels. These data provide a benchmark for future monitoring.
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    Influences of cadmium and zinc interaction and humic acid on metal accumulation in Ceratophyllum demersum
    (2007-03-01) Sushera Bunluesin; Prayad Pokethitiyook; Guy R. Lanza; Julian F. Tyson; Maleeya Kruatrachue; Baoshan Xing; Suchart Upatham; Mahidol University; University of Massachusetts; Burapha University
    Interactions between Zn and Cd on the accumulation of these metals in coontail, Ceratophyllum demersum were studied at different metal concentrations. Plants were grown in nutrient solution containing Cd (0.05-0.25 mg l-1) and Zn (0.5-5 mgl-1). High concentrations of Zn caused a significant decrease in Cd accumulation. In general, adding Cd solution decreased Zn accumulation in C. demersum except at the lowest concentration of Zn in which the Zn accumulation was similar to that without Cd. C. demersum could accumulate high concentrations of both Cd and Zn. The influence of humic acid (HA) on Cd and Zn accumulation was also studied. HA had a significant effect on Zn accumulation in plants. 2 mg l-1of HA reduced Zn accumulation at 1 mg l-1level (from 2,167 to 803 mg kg-1). Cd uptake by plant tissue, toxicity symptoms and accumulation at 0.25 and 0.5 mg l-1, were reduced (from 515 to 154 mg kg-1and from 816 to 305 mg kg-1, respectively) by addition of 2 mg l-1of HA. Cd uptake reached a maximum on day 9 of treatment, while that of Zn was observed on day 15. Long-term accumulation study revealed that HA reduced toxicity and accumulation of heavy metals. © 2006 Springer Science+Business Media B.V.
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    Phytoremediation of cadmium contaminated wetland using aquatic macrophytes
    (Mahidol University. Mahidol University Library and Knowledge Center, 2023) Sushera Bunluesin; Maleeya Kruatrachue