scholarly journals Detection and Spatial Mapping of Mercury Contamination in Water Samples Using a Smart-Phone

ACS Nano ◽  
2014 ◽  
Vol 8 (2) ◽  
pp. 1121-1129 ◽  
Author(s):  
Qingshan Wei ◽  
Richie Nagi ◽  
Kayvon Sadeghi ◽  
Steve Feng ◽  
Eddie Yan ◽  
...  
Keyword(s):  
Water Samples ◽  
Smart Phone ◽  
Mercury Contamination ◽  
Spatial Mapping

Combination of a methylene blue – iodide system with a smart phone based portable colorimeter for on-site determination of nitrite

2022 ◽  
Author(s):  
Leila Khoshmaram ◽  
Sona Tabaghchi ◽  
Fahimeh Farshi Azhar
Keyword(s):  
Methylene Blue ◽  
Water Samples ◽  
Smart Phone ◽  
Rapid Technique

In this study, a simple, cheap and rapid technique has been developed for on-site determination of nitrite in different water samples relying on a methylene blue – iodide system and...

scholarly journals A Portable Smart-Phone Readout Device for the Detection of Mercury Contamination Based on an Aptamer-Assay Nanosensor

Sensors ◽  
2016 ◽  
Vol 16 (11) ◽  
pp. 1871 ◽  
Author(s):  
Wei Xiao ◽  
Meng Xiao ◽  
Qiangqiang Fu ◽  
Shiting Yu ◽  
Haicong Shen ◽  
...  
Keyword(s):  
Smart Phone ◽  
Mercury Contamination ◽  
Readout Device ◽  
Aptamer Assay

Combined experimental and theoretical studies on a phenyl thiadiazole-based novel turn-on fluorescent colorimetric Schiff base chemosensor for the selective and sensitive detection of Al3+

2020 ◽  
Vol 44 (26) ◽  
pp. 10819-10832 ◽  
Author(s):  
Amit Kumar Manna ◽  
Shubhamoy Chowdhury ◽  
Goutam K. Patra
Keyword(s):  
Schiff Base ◽  
Detection Limit ◽  
Water Samples ◽  
Logic Gate ◽  
Colorimetric Detection ◽  
Smart Phone ◽  
Contaminated Water ◽  
Theoretical Studies ◽  
Turn On ◽  
Experimental And Theoretical Studies

A phenyl thiadiazole based receptor (L) has been presented for fluorescent colorimetric detection of Al3+ ion with very low detection limit in aqueous medium. The probe L can be applied for logic gate formation, recovery of contaminated water samples and smart-phone based analysis.

A novel hydrazide-based selective and sensitive optical chemosensor for the detection of Ni2+ ions: applications in live cell imaging, molecular logic gates and smart phone-based analysis

2019 ◽  
Vol 48 (32) ◽  
pp. 12336-12348 ◽  
Author(s):  
Amit Kumar Manna ◽  
Shubhamoy Chowdhury ◽  
Goutam K. Patra
Keyword(s):  
Optical Sensor ◽  
Water Samples ◽  
Live Cell Imaging ◽  
Cell Imaging ◽  
Smart Phone ◽  
Logic Gates ◽  
Live Cell ◽  
Contaminated Water ◽  
Molecular Logic ◽  
Molecular Logic Gates

A novel hydrazide-based optical sensor for Ni2+ ions was designed, which can be applied for recovery of contaminated water samples, smart phone-based analysis and live cell imaging.

scholarly journals HEAVY METAL CONTENTS IN MARINE SEDIMENTS AND SEAWATER AT TOTOK BAY AREA, NORTH SULAWESI

2016 ◽  
Vol 25 (1) ◽  
pp. 39 ◽  
Author(s):  
Delyuzar Ilahude
Keyword(s):  
Heavy Metal ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Marine Sediment ◽  
Water Samples ◽  
Absorption Spectrometry ◽  
Mercury Contamination ◽  
North Sulawesi ◽  
Illegal Mining ◽  
Geological Institute

The study area is located in north-eastern part of Tomini Bay, approximately 80 km south of Manado city, North Sulawesi. This area is closed to submarine tailing disposal system in Buyat Bay. Five marine sediment samples and four water samples from seawater and dig wells have been used for heavy metals (Hg, As, CN) analyses by using Atomic Absorption Spectrometry (AAS). This study is a part of research conducted by Marine Geological Institute of Indonesia on morphological changes of seabed in the Totok Bay. The result shows that concentration of mercury (Hg) in water samples taken from Ratatotok estuary is higher than standards stipulated Government Regulation (Peraturan Pemerintah/PP) No. 82/2001. Meanwhile, concentration of arsenic (As) is almost reaching its standard threshold, and conversely cyanide (CN) concentration is low. This value of mercury (Hg) concentration taken from Ratatotok estuary is much higher than water samples from of Buyat Bay estuary. Significant concentration of mercury (Hg) analysed from those particular sampling sites indicated high mercury contamination. Therefore, further examination on ground water of dig wells is necessary, especially for mercury analysis (Hg). Furthermore, comparing the formerly obtained data of mercury concentration in the sediment, this particular study concludes that the sediments in the Totok Bay had contaminated by mercury from gold-processing of illegal mining. Keywords: pollution, heavy metal, marine sediment, seawater, Totok Bay Daerah penelitian terletak di bagian timur laut Teluk Tomini, sekitar 80 km selatan kota Manado, Sulawesi Utara. Lokasi ini berdekatan dengan tempat pembuangan limbah tambang bawah laut di Teluk Buyat. Lima contoh sedimen laut, lima buah contoh air dari laut dan sumur telah digunakan untuk analisa logam berat (Hg, As, dan CN) menggunakan metode Atomic Absorption Spectrometry AAS. Studi ini merupakan bagian dari penelitian yang dilakukan oleh Marine Geological Institute of Indonesia tentang perubahan morfologi dasar laut di Teluk Totok. Hasil penelitian menunjukkan bahwa kandungan merkuri dalam contoh air yang diambil dari sekitar muara sungai Ratatotok lebih tinggi dari standar Peraturan Pemerintah/PP No. 82/2001. Sementara itu, konsentrasi arsen (As) hampir mencapai ambang batas standar dan konsentrasi sianida (CN) jauh lebih rendah dari standar ambang batas. Nilai kandungan merkuri di estuari Ratatotok lebih tinggi dibandingkan dengan contoh air yang terukur dari muara sungai di Teluk Buyat. Kandungan merkuri yang tinggi ini menunjukkan adanya indikasi pencemaran logam berat, dan oleh karena itu air di sumur-sumur penduduk perlu dilakukan penelitian lebih lanjut, khususnya untuk analisa merkuri. Selain itu, berdasarkan perbandingan kandungan merkuri dalam sedimen pada penelitian sebelumnya, dapat disimpulkan bahwa Teluk Totok telah mengalami kontaminasi merkuri dari penambangan emas ilegal. Kata kunci: polusi, logam berat, sedimen laut, air laut, Teluk Totok

scholarly journals Contamination of the Dzheltulak-1 river basin under alluvial gold mining (the Amur region)

2021 ◽  
Vol 44 (4) ◽  
pp. 471-484
Author(s):  
V. I. Radomskaya ◽  
S. M. Radomskiy ◽  
A. S. Segrenev ◽  
S. Y. Kulik
Keyword(s):  
Bottom Sediments ◽  
Water Samples ◽  
Gold Mining ◽  
Atomic Emission ◽  
Amur Region ◽  
Mercury Contamination ◽  
Free Form ◽  
X Ray ◽  
Mass Spectral ◽  
Copper Aluminum

The purpose of the introduced research is to study the environmental impact of placer gold mining. The object of the study is natural and natural-man-made geosystems of the Dzheltulak-1 river located in the Amur region. The content of the main cations and microelements in water samples was determined by atomic emission and mass spectral methods. The content of micro- and rock-forming elements in bottom sediments and soils was determined by X-ray fluorescence using XRF-1800 X-ray spectrometer (Shimadzu, Japan). The results of the conducted studies indicate that the contents of iron, manganese, copper, aluminum, vanadium, molybdenum, mercury and ammonium ions exceed commercial fishery standards in a significant part of the surface water samples. It is found out that settlement ponds negatively affect the water quality in the river Dzheltulak-1 downstream due to the dam drainage. The highest concentrations of dissolved forms of mercury were noted in the water of the settlement ponds. The gross content of arsenic in the samples of bottom sediments and soils exceeds sanitary and hygienic standards by 2.7–14.5 times. The distributions of mercury as the most dangerous pollutant among the biogenic components of geochemical landscape were worked out in detail. Mercury contamination of soils was classified according to the forms of mercury occurrence: free, physically sorbed, chemisorbed, sulfide and isomorphic. It has been shown that the free form is characteristic of fresh mercury contamination due to the use of prohibited technological schemes for gold-bearing sands separation by the amalgamation method.

Mercury contamination of sea water samples stored in polyethylene containers

1975 ◽  
Vol 47 (3) ◽  
pp. 592-595 ◽  
Author(s):  
Micheal H. Bothner ◽  
D. E. Robertson
Keyword(s):  
Water Samples ◽  
Sea Water ◽  
Mercury Contamination

scholarly journals Assessment of the bioremediation efficacy of the mercury resistant bacterium isolated from the Mithi River

2018 ◽  
Vol 19 (1) ◽  
pp. 191-199 ◽  
Author(s):  
Bhupendra Pushkar ◽  
Pooja Sevak ◽  
Suvarna Sounderajan
Keyword(s):  
16S Rdna ◽  
River Water ◽  
Water Samples ◽  
Bacterial Isolate ◽  
Heterotrophic Bacteria ◽  
Mercury Contamination ◽  
Resistant Bacteria ◽  
Biochemical Tests ◽  
River Water Samples ◽  
Wide Range

Abstract The contamination of natural resources with mercury has gained attention due to its high toxicity to all life forms. Bioremediation of mercury using bacteria is a useful technique to remediate mercury contamination. In the present study mercury resistant bacteria (MRB) were isolated from Mithi River water samples. Total heterotrophic bacteria (THB) and MRB present in the Mithi river water samples were enumerated. The count for THB was found to be 3.7 × 106 CFU/ml. MRB enumerated in the nutrient agar medium with mercury concentrations of 50, 100 and 150 ppm had counts of 2.8 × 106, 9.1 × 105 and 5.8 × 104 CFU/ml, respectively. The minimum inhibitory concentration (MIC) of the isolated bacterium was found to be around 500 ppm of mercury, and it was selected for further analysis. The bacterial isolate was found to tolerate a wide range of salt concentrations from 5 to 35 ppt of NaCl. The bacterial isolate was characterized by using standard biochemical tests and identified by using the 16S rDNA technique. Homology analysis of the 16S rDNA gene has confirmed the identity of the bacterium as Bacillus thuringiensis strain RGN1.2 with NCBI accession no. KX832953.1. It could remove 96.72%, 90.67% and 90.10% of mercury in 48 hours at 10, 25 and 50 ppm of mercury.

Pollutant Identification by Selected Area Electron Diffraction

1974 ◽  
Vol 32 ◽  
pp. 532-533
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson ◽  
C. W. Walker
Keyword(s):  
Thermal Treatment ◽  
Electron Diffraction ◽  
Sample Preparation ◽  
Crystal Structures ◽  
Water Samples ◽  
Environmental Samples ◽  
Short Review ◽  
Selected Area Electron Diffraction ◽  
Multiple Component

Selected area electron diffraction (SAD) has been used successfully to determine crystal structures, identify traces of minerals in rocks, and characterize the phases formed during thermal treatment of micron-sized particles. There is an increased interest in the method because it has the potential capability of identifying micron-sized pollutants in air and water samples. This paper is a short review of the theory behind SAD and a discussion of the sample preparation employed for the analysis of multiple component environmental samples.

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