scholarly journals Determination of naproxen, ibuprofen and triclosan in wastewater using the polar organic chemical integrative sampler (POCIS): A laboratory calibration and field application

Water SA ◽  
2014 ◽  
Vol 40 (3) ◽  
pp. 407 ◽  
Author(s):  
R Amdany ◽  
L Chimuka ◽  
E Cukrowska
Keyword(s):  
Field Application ◽  
Organic Chemical ◽  
Laboratory Calibration

scholarly journals Determination of Glycol Ethers in Ambient Air by Adsorption Sampling and Thermal Desorption with GC/MS Analysis: Performance Evaluation and Field Application

2012 ◽  
Vol 9 (2) ◽  
pp. 970-979
Author(s):  
Young-Kyo Seo ◽  
Sung-Ok Baek
Keyword(s):  
Thermal Desorption ◽  
Analytical Method ◽  
Ambient Air ◽  
Industrial Area ◽  
Field Application ◽  
Ambient Atmosphere ◽  
Glycol Ethers ◽  
Ms Analysis ◽  
Sampling Campaign

Some of glycol ethers, such as 2-methoxyethanol (2-ME) and 2-ethoxyethanol (2-EE) are known to be toxic and classified as hazardous air pollutants in USA, Japan and Germany. In Korea, however, there has been no study conducted so far for these compounds in ambient air. In addition, no clear methodologies for the measurement of glycol ethers have been yet established. We carried out this study to evaluate a sampling and analytical method for the determination of glycol ethers, in ambient air samples collected in specific industrial areas of South Korea. To measure glycol ethers, adsorption sampling and thermal desorption with GC/MS analysis were used in this study. The analytical method showed good repeatability, linearity and sensitivity. The lower detection limits were estimated to be approximately 0.3∼0.5 ppb. Based on storage tests, it was suggested that samples should be analyzed within two weeks. It was also demonstrated that this method can be used for the simultaneous measurement of glycol ethers and other aromatic VOCs such as benzene, toluene, and xylenes. Field sampling campaign was carried out at 2 sites, located in a large industrial area, from October 2006 to June 2007, and a total of 480 samples were collected seasonally. Among them, 2-ME was not detected from any samples, while 2-EE and 2-Ethyloxyethylacetate (2-EEA) were found in 7 and 70 samples, respectively. The measured concentrations of 2-EE and 2-EEA for samples were ranged from 0.7-2.5 ppb and from 0.5-10.5 ppb, respectively. To our knowledge, this is the first measurement report for glycol ethers in the ambient atmosphere not only in Korea but also the rest of the world.

Evaluation of polar organic chemical integrative and hollow fibre samplers for the determination of a wide variety of organic polar compounds in seawater

Talanta ◽  
2018 ◽  
Vol 185 ◽  
pp. 469-476 ◽  
Author(s):  
Leire Mijangos ◽  
Haizea Ziarrusta ◽  
Ailette Prieto ◽  
Oihane Zugazua ◽  
Olatz Zuloaga ◽  
...  
Keyword(s):  
Polar Compounds ◽  
Hollow Fibre ◽  
Organic Chemical

Simultaneous determination of sulfoxaflor and its metabolites, X11719474 and X11721061, in brown rice and rice straw after field application using LC-MS/MS

2017 ◽  
Vol 97 (2) ◽  
pp. 99-111 ◽  
Author(s):  
Hyung Suk Chung ◽  
A. M. Abd El-Aty ◽  
Sung-Woo Kim ◽  
Han Sol Lee ◽  
Md. Musfiqur Rahman ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Rice Straw ◽  
Brown Rice ◽  
Field Application

scholarly journals Penentuan β-karoten dalam buah wortel (Daucus Carota) secara kromatografi cair kinerja tinggi (U-HPLC)

2019 ◽  
Vol 4 (1) ◽  
pp. 36
Author(s):  
Sonlimar Mangunsong ◽  
Rifqi Assiddiqy ◽  
Eka Puspa Sari ◽  
Priscila Natalia Marpaung ◽  
Rahma Arum Sari
Keyword(s):  
Free Radicals ◽  
Daucus Carota ◽  
High Performance ◽  
Calcium Salt ◽  
Beta Carotene ◽  
The Body ◽  
Organic Chemical ◽  
Chloroform Methanol ◽  
Β Carotene

The lifestyle of people who tend to be unhealthy causes a lot of free radicals in the body which can cause various diseases, especially degenerative diseases. To protect the body from attacks by free radicals, the body needs antioxidants such as β-carotene. One of the vegetables containing β-carotene is “wortel” Daucus carota, that  is very large in agriculture. The spread of beta carotene from carrots with chemical solvents has been done a lot, but without chemical solvents it has never been done. Based on the color, the content of β-carotene contained in carrots determines the content of beta carotene. The juice obtained by calcium salt was then centrifuged for 3000 rpm 15 minutes. The pellets are separated from the solution, evaporated to dryness, measured at a wavelength of 450-460. Pellets as beta-carotene calcium salts were analyzed by U-HPLC. The next pellet is measured at 460 wavelengths. The levels are determined by high performance liquid chromatography using C18 column and the mobile phase of chloroform-methanol (95:5) with a flow rate of 1 ml / minute at a wavelength of 460 nm. The content of β-carotene in the examination is up to 92,5%. The retention time obtained is 1,903 minutes. The results showed that this method can be used for the withdrawal and determination of β-carotene levels without organic chemical solvents.Pola  hidup masyarakat yang cenderung tidak sehat menyebabkan  banyak radikal bebas di dalam tubuh yang dapat mengakibatkan berbagai penyakit terutama penyakit degeneratif. Perlindungan tubuh dari serangan radikal bebas, perlu antioksidan seperti β-karoten. Salah satu sayuran  yang mengandung β-karoten adalah wortel, jumlahnya sangat banyak dalam pertanian. Berdasarkan warnanya, maka kandungan β-karoten yang terdapat dalam wortel menjadi penentu  kandungan beta karoten Metode ektraksi yang aman dari bahan pelarut kimia mutlak diperlukan.  Untuk mengetahui kandungan β-karoten dalam wortel,  lebih  dahulu dilakukan penghalusan  dengan blender, kemudian sari difilter /dipisahkan dari ampasnya. Sari  yangdiperleh ditambahkan garam kalsium kemudian disentrifus 3000 rpm  15 menit. Pelet dipisahkan dari larutannya, diuapkan hingga kering, Diukur pada panjang gelombang 450-460. Pelet sebagai garam kalsium betakaroten dianalisa dengan U-HPLC.  Pelet selanjutkan diukur pada panjang gelombang 460. ditetapkan kadarnya secara kromatografi cair kinerja tinggi menggunakan kolom C18 dan fase gerak kloroform–metanol (95:5) dengan laju alir 1 ml/menit pada panjang gelombang 460 nm. Kandungan β-karoten dalam pemeriksaan  sampai 92,5%. Waktu retensi yang diperoleh adalah 1,903 menit.  Hasil penelitian menunjukkan bahwa metode ini dapat digunakan untuk penarikan dan penetapan kadar β-karoten dalam   tanpa pelarut kimia organik.

Optimal Transceiver Distance of Controlled-source Audio-frequency Magnetotelluric Sounding Method

2021 ◽  
Vol 26 (2) ◽  
pp. 111-116
Author(s):  
Lei Zhou ◽  
Xingbing Xie ◽  
Xinyu Wang ◽  
LiangJun Yan
Keyword(s):  
Field Application ◽  
Audio Frequency ◽  
Space Condition ◽  
Field Source ◽  
Main Method ◽  
Controlled Source ◽  
Actual Field ◽  
Mathematical Derivation ◽  
Ground Wave

Currently, the use of Cagniard apparent resistivity and phase is still the main method and means to process and interpret controlled-source audio-frequency magnetotelluric (CSAMT) sounding data. The CSAMT data must meet the conditions in the far zone to use the magnetotelluric (MT) sounding inversion interpretation method. The conditions in the far zone are directly related to transceiver distance; Hence, the distance measured by the CSAMT method is directly related to the reliability and credibility of the data. In this study, based on the formation wave and ground wave of the analytical expression for the electric field in a uniform half-space condition, the response laws of the formation wave and the ground wave are analyzed. After rigorous mathematical derivation, the formula for determining the optimal transceiver distance of the CSAMT is obtained, and the steps for using this formula in practical application are given. The actual field application verifies the rationality of the derived formula. This study provides a reference for the design of a CSAMT field source, and effectively guides the determination of CSAMT transceiver distance in the field.

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