55 research outputs found
Placement Test Program Unand-Deakin Pre-departure Training Batch 4
No full textpelaksanaan Placement Test untuk Program Unand-Deakin Pre-departure Training Batch 4 yang akan dilaksanakan awal Bulan Mei, kami mohon agar pengumuman pembukaan pendaftaran program tersebut dapat dipublikasi di website Unand.
Adapun untuk batas waktu pendaftaran yaitu tanggal 29 April 2016
PNT-66-LC-Plastificantes-Agua-SALLE
No full textProcedimiento Normalizado de Trabajo, para la determinación de plastificantes emergentes en agua mediante LC-Q-OrbitrapMinisterio de Economía y Competitividad de España. Referencia Proyecto: PID2022-137122OB-I0
Development of novel methods based on GC-HRMS and LC-HRMS for the determination of non-phthalate plasticizers in soil
No full textNon-phthalate plasticizers (NPPs) are a suitable alternative to phthalates, which are harmful compounds for human, animal health, and the environment. In this study, 28 commercial non-phthalate plasticizers (NPPs) from different families, including adipates, citrates, phosphates, sebacates, trimellitates, benzoates and cyclohexanoates, were determined. Two novel methods for determining these alternative compounds in soil were developed using gas chromatography coupled to high-resolution mass spectrometry (GCHRMS-Q-Orbitrap) and liquid chromatography coupled to high-resolution mass spectrometry (LC-HRMS-Q-Orbitrap). Solid-liquid extraction (SLE) with ethyl acetate or acetonitrile, along with water as extraction solvents, were employed. In most cases, the GC method exhibited recoveries ranging from 84.9 % to 110.8 % at 20, 40 and 200 μg/kg, while the LC method achieved recoveries between 73.1 % and 115.4 % at 10, 20, 40 and 200 μg/kg. Most of the relative standard deviation (RSD) values were below 20 % for both methods. The validated methods were then applied to analyse soil samples collected from four different areas in Almeria. The results indicated that the compounds detected most frequently at high concentrations were 1-hydroxycyclohexyl phenyl ketone (HCPK) using GC, in the range 29.1 – 67.4 μg/kg and 2,2,4-trimethyl-1,3-pentanediol diisobutyrate (TXIB) using LC, in the range 39.9 – 51.5 μg/kg. Additionally, suspect and unknown analysis were carried out, and other plasticizers as phthalates, were also detected, in addition to other substances present in the analysed samples. All the soils exhibited the presence of a few plasticizers, either phthalic and/or non-phthalic
Unravelling plant protection product analysis: use of chromatography techniques (GC and LC) and high resolution mass spectrometry
No full textThis study proposes a methodology for the characterization of plant protection products (PPPs) based on suspect and unknown analyses. This was divided in three main stages: sample preparation, separation and detection, and data analysis. Sample preparation was based on dilute and shoot strategies employing different solvents depending on both the type of compounds and the type of PPPs to be analyzed. Chromatographic techniques, as liquid (LC) and gas chromatography (GC), coupled with high resolution mass spectrometry (HRMS) analyzers are used for the separation and detection stage. HRMS allowed a huge number of possibilities in terms of data acquisition, and this work reveals the most suitable options and the principal parameters to maximize the number of features and to perform an accurate detection. Finally, tips and recommendations to perform data analysis are indicated, providing the pre-processing and processing strategies to perform suspect screening and unknown analysis
Rancang Bangun Detektor Sinyal Radio Frequency Smartphone dengan Frekuensi Operator GSM1800
No full textTelah dilakukan rancang bangun detektor sederhana yang mengubah energi gelombang radio (radio frequency) dari sinyal smartphone menjadi energi listrik. Rancangan detektor sinyal radio frequency terdiri dari rangkaian LC, IC LM386 dan Arduino Uno. Smartphone yang dihidupkan akan memancarkan gelombang radio yang akan melewati antena. Gelombang radio akan menginduksi tegangan ke antena dan akan mengubahnya menjadi energi lisrik. Pengolahan data dilakukan dengan menggunakan mikrokontroler Arduino Uno yang mengontrol LED dan buzzer sebagai indikator peringatan terdeteksinya sinyal radio frequency. Detektor dapat menangkap sinyal radio frequency dari smartphone pada jarak maksimal 3,5 cm tanpa harus dilakukan panggilan atau pengiriman teks dan dapat mendeteksi sinyal frekuensi elektromagnetik (30 MHz – 300 MHz) pada jarak maksimal 35 cm. A simple detector design has been done which converts radio wave energy from radio signals to electrical energy. The design of the radio frequency signal detector consists of a series of LC, IC LM386 and arduino uno. The smartphone that is turned on will emit radio waves that will pass through the antenna. Radio waves will induce a voltage to the antenna and will convert it into electrical energy. Data processing is performed using the arduino uno microcontroller which controls LED and buzzer as a warning indicator when radio frequency detected. The detector can capture radio frequency signals from a smartphone at a maximum distance of 3.5 cm without having to make calls or send texts and can capture electromagnetic frequency (30 MHz – 300 MHz) signals at maximum distance of 35 cm
Determination of transformation products of difenoconazole in tomato by LC-Q-Orbitrap-MS and a non-target approach: laboratory trials
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