scholarly journals Characterisation of microplastic debris in beach sediment of the coastal zone in Vietnam: A preliminary study in Da Nang

2021 ◽  
Vol 63 (11) ◽  
pp. 7-13
Author(s):  
Van Manh Do ◽  
◽  
Thi Thom Dang ◽  
Xuan Thanh Thao Le ◽  
Duy Thanh Nguyen ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Sediment Sample ◽  
Beach Sediment ◽  
Ethylene Vinyl Alcohol ◽  
Sediment Samples ◽  
Adaptation Procedure ◽  
Global Concern ◽  
Preliminary Study ◽  
The One

Microplastic (MP) pollution has become a global concern and a hot issue in Vietnam, especially along the coastal hydrosphere. The investigation was carried out by collecting the sediment samples from three typical urbanised beaches in Da Nang: My Khe, T20, and Son Thuy. The qualitative identification and quantitative analysis of MP samples were conducted using micro-Fourier-transform-infrared spectroscopy (μFTIR). A tailored analysis based on adaptation procedure of well-known ones was applied including 5 steps: (1) Drying and homogenising sediment sample; (2) Digestion and cleaning sediment sample; (3) MPs separation by the flotation; (4) MPs sample filtration; (5) MPs quantification and identification. The obtained data showed that the abundances of MPs at three beaches of Son Thuy, T20, and My Khe were 1,460±758, 1,799±370, and 29,232±2,577 items/kg dry sediment, respectively. MPs were classified by different sizes, in which the one with sizes being smaller than 150 μm was accounted for the highest proportion of 77.83% at Son Thuy, 87.96% at T20, and 65.91% at My Khe beach. The chemical composition of MPs with various polymers was precisely identified, in which three dominant polymers were determined as PTFE [Polytetrafluoroethylene (Teflon)], EVOH (Ethylene vinyl alcohol), and PA [Polyamide (Nylon)]. Preliminary results of MPs analysis in sediment samples of the three selected beaches in Da Nang can be interpreted as a solid basis for further investigation of MP debris in the shoreline, offshore, and other related samples towards conclusions about the sources of MP pollution in the marine environment in Vietnam’s coastal hydrosphere in future.

scholarly journals Preliminary Study of Distribution and Quantity of Plastic-debris on Beaches Along the Coast at Phuket Province

2019 ◽  
pp. 54-62 ◽  
Author(s):  
Pensiri Akkajit ◽  
Sudarat Thongnonghin ◽  
Siriporn Sriraksa ◽  
Supissara Pumsri
Keyword(s):  
Preliminary Investigation ◽  
Sampling Location ◽  
Coastal Environments ◽  
Beach Sediment ◽  
Plastic Debris ◽  
Sediment Samples ◽  
Management Plans ◽  
Stereo Microscope ◽  
Preliminary Study

The beach sediment samples from Kalim, Tri Trang, and Patong Beaches, Phuket Province, southern of Thailand were collected for preliminary investigation on coastal debris. A total of 9 samples were taken from a 1 x 1 m quadrat at the depth of 5 cm, parallel with the shore during the period of maximum low tides in November, 2018. Microplastics (particles size < 5 mm) were extracted using sodium chloride (1.15 g mL-1) and their characteristics- including abundance (items m-2), weight (g), density (itemsm-2), color and shape- were determined using a stereo microscope. The results showed that microplastic debris varied in abundance from 1 to 35 items m-2 at the three selected beaches, depending on sampling location. In comparison, abundance of macroplastic (> 2.5 cm) and mesoplastic debris (5 mm to 2.5 cm) varied from 1 item m-2 quadrat (Kalim Beach) to 38 items (Patong Beach), 9 items (Tri Trang Beach) and 68 items (Patong Beach) m-2. Blue fibers were predominant among microplastic debris found at Kalim Beach; these are likely to have originated from pieces of rope, safeguard lines and fishing materials. In contrast, microplastic debris found in Patong and Tri Trang Beaches were predominantly green in color. The results of this study provide an overview of the sources of microplastics in coastal environments, which provides a basis for developing long term plastic management plans for these highly popular beaches in Phuket Province.

scholarly journals Analysis of the Chemical Composition of Urinary Calculi using Fourier Transform Infrared Spectroscopy: A Preliminary Study

2014 ◽  
Vol 48 (3) ◽  
pp. 128-131
Author(s):  
Shalmoli Bhattacharyya ◽  
Arup Kumar Mandal ◽  
Shrawan Kumar Singh
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Chemical Composition ◽  
Fourier Transform Infrared Spectroscopy ◽  
Stone Formation ◽  
Urinary Calculi ◽  
Fourier Transform Infrared ◽  
Dietary Factors ◽  
The Body ◽  
Preliminary Study

ABSTRACT Background The etiology of primary and recurrent stone formation in the urinary tract remains obscure in spite of intensive research. The formation of renal calculi is a multifactorial disorder resulting from the combined influence of epidemiological, biochemical and genetic risk factors which disturb the lithogenous salt profile in the body. Materials and methods In the present study, 52 stone samples have been analyzed for their stone composition by Fourier transform infrared spectroscopy (FTIR). The samples were made in a potassium bromide pellet and analyzed to identify the stone components. Results Stone formation was more prevalent in males and the incidence increased with age. Majority of stones were oxalate and mixed stones. The components of mixed stones were identified by spectrum analysis. Conclusion Specific dietary factors can affect the urinary composition and supersaturation, which in turn, can affect the process of crystallization and stone formation. The same chemical components may crystallize in different forms during stone formation. Hence, proper analysis has to identify not only the molecular species present in the calculus, but also the crystalline form. So, quantitative evaluation of all components of the calculi is necessary for effective prevention or reduction of stone recurrences. How to cite this article Bhattacharyya S, Sharma G, Mandal AK, Singh SK. Analysis of the Chemical Composition of Urinary Calculi using Fourier Transform Infrared Spectroscopy: A Preliminary Study. J Postgrad Med Edu Res 2014;48(3):128-131.

Polarization-Division Beamsplitters with KBr and KRS-5 Substrates for Fourier Transform Infrared Spectroscopy

1996 ◽  
Vol 50 (1) ◽  
pp. 98-101 ◽  
Author(s):  
Prasad L. Polavarapu ◽  
Zhengyu Deng ◽  
Stephen Weibel
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Good Potential ◽  
The One

Polarization-division beamsplitters with KBr and KRS-5 substrates were constructed and evaluated for their performance in Fourier transform infrared spectroscopy. It is found that the beamsplitter with a KRS-5 substrate is not practically useful; the one with a KBr substrate has good potential, although its current performance is significantly poorer than the performance of a beamsplitter with a BaF2 substrate. Representative spectra obtained with a KBr beamsplitter are presented.

scholarly journals Multi-method (XRF, FTIR, TGA) analysis of ancient bricks from Karabalgasun : A preliminary study

2020 ◽  
pp. 1-8
Author(s):  
Saran Solongo ◽  
Christina Franken ◽  
Saran Tengis ◽  
Erdenebat Ulambayar ◽  
Tumur-Ochir Batbayr
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Tg Analysis ◽  
X Ray ◽  
Ancient Ceramic ◽  
Preliminary Study ◽  
Xrf Spectroscopy ◽  
Tga Analysis

Ancient ceramic artefacts attracted the attention of scientists as being a chronological indicator within the archaeological context; however, they can also provide information about the tech-nology and provenance. A series of brick samples from an ancient nomadic town at Karabal-gasun (Mongolia) have been analyzed using X-ray fluorescence (XRF) spectroscopy, Fourier transform infrared spectroscopy (FTIR) and thermogravimetric (TG) analysis in order to obtain information on the performance of the kilns used and on the technological skills of ancient pot-ters.

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