scholarly journals Spatial distribution of manganese concentration and load in street dust in Mexico City

2020 ◽  
Vol 62 (2, Mar-Abr) ◽  
pp. 147
Author(s):  
Anahí Aguilera ◽  
Francisco Bautista ◽  
Avto Gogichaichvili ◽  
Margarita Eugenia Gutiérrez-Ruiz ◽  
Agueda E Ceniceros-Gómez ◽  
...  
Keyword(s):  
Mexico City ◽  
Inductively Coupled Plasma ◽  
Anthropogenic Activities ◽  
Contamination Factor ◽  
Optical Emission ◽  
Street Dust ◽  
Manganese Concentration ◽  
Inductively Coupled ◽  
Mn Content ◽  
Mn Concentration

Objective. To obtain a first indication of the distribution and extent of manganese (Mn) contamination in Mexico City. Mn concentration and load in street dust were analyzed in order to reveal the most contaminated areas. Materials and methods. 482 samples of street dust were analyzed through inductively coupled plasma-optical emission spec­troscopy. The contamination factor (CF), the geoaccumula­tion index (Igeo) and the spatial interpolations of the kriging indicator were calculated. Results. A slight influence of anthropogenic activities is detected on the Mn content of street dust. The highest levels of pollution by concentra­tion (Igeo=uncontaminated to moderately contaminated) are grouped towards the city’s north (industrial) and center (commercial and high traffic) areas. The areas with the high­est Mn load were located towards the east and northwest areas (Igeo=moderately contaminated). Conclusions. These findings will serve as a baseline to assess future variations in Mn content in Mexico City’s environment.

Analysis of Heavy Metal Compositions in Shah Alam Multi Storey House

2015 ◽  
Vol 1113 ◽  
pp. 759-763
Author(s):  
Zitty Sarah Ismail ◽  
Nurzulaifa Shaheera Erne Mohd Yasim ◽  
Farhana Mazlan ◽  
Suhanom Mohd Zaki
Keyword(s):  
Heavy Metals ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Street Dust ◽  
Emission Spectrometry ◽  
Inductively Coupled ◽  
Indoor Sources ◽  
Level 3 ◽  
Plasma Optical Emission Spectrometry ◽  
Level 2

The purpose of the present study is to identify and to analyze of selected elemental composition in a multi storey house. The concentrations of heavy metals (Cd, Cu, Fe, Ni, Pb and Zn) were determined using inductively coupled plasma-optical emission spectrometry (ICP-OES) after digestion with nitric acid and sulphuric acid. The results showed that the highest concentration of heavy metals in eight investigated microenvironment was Fe. The heavy metals concentration were in the order of Fe > Cr > Zn > Cu > Pb > Mn > Ni. All six heavy metals concentration at four different levels of multi storey house were followed the order of Level 1 > Level 2 > Level 3 > Level 4. The correlation analysis was applied to metals variable in order to identify the sources of airborne contaminant.It was indicated that the possible contributor heavy metals in multi storey houses were originated from outdoor sources such as vehicle exhausts, street dust and indoor sources such as cooking, smoking, and cleaning activities.

Concentration and biotransformation of arsenic by Prosopis sp. grown in soil treated with chelating agents and phytohormones

2008 ◽  
Vol 5 (5) ◽  
pp. 320 ◽  
Author(s):  
Martha Laura López ◽  
José R. Peralta-Videa ◽  
Jason G. Parsons ◽  
Maria Duarte-Gardea ◽  
Jorge L. Gardea-Torresdey
Keyword(s):  
Inductively Coupled Plasma ◽  
Chelating Agents ◽  
Anthropogenic Activities ◽  
Optical Emission ◽  
Nitrilotriacetic Acid ◽  
Desert Plant ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Toxic Metalloid

Environmental context. Arsenic (As) is a metalloid found throughout the environment. Although As can be released from natural phenomena, anthropogenic activities account for most As contamination worldwide. The toxicity of As depends on the form (inorganic or organic) and species (AsIII or AsV), among others. Plants have the ability to absorb and bioreduce As, cleaning the soil and reducing the toxicity of As to some extent. The aim of the present research was to study the effects of cysteine, the chelating agents cyclohexylenedinitrotetraacetic acid and nitrilotriacetic acid, and the phytohormone kinetin on the As concentration and speciation in mesquite (Prosopis sp.). The results give an insight about how a desert plant absorbs, bioreduces, distributes and stores this toxic metalloid. Abstract. The aim of the present research was to study the effects of cysteine (Cys), cyclohexylenedinitrotetraacetic acid (CDTA), nitrilotriacetic acid (NTA), and kinetin (KN) on the arsenic (As) concentration and speciation in mesquite (Prosopis sp.) grown in soil containing 30 ppm (parts per million) of AsIII or 50 ppm of AsV. Inductively coupled plasma–optical emission spectroscopy (ICP-OES) determinations revealed that, compared with As alone, roots of plants treated with 2.5 mM CDTA or 0.5 mM of Cys + 100 μM KN increased total As concentration from AsIII by ~20 and 36% and from AsV by 100 and 65%, respectively. Liquid chromatography–inductively coupled plasma–mass spectrometry (LC-ICP-MS) studies revealed that in roots, AsIII remained without change, whereas both AsIII and AsV were found in plants grown with AsV. X-ray absorption spectroscopy (XAS) studies revealed that As within plants was mainly coordinated to three sulfur atoms, with interatomic distances of 2.26 Å. Results suggests that Cys + KN increased the mesquite tolerance to AsV, because plants grown in AsV had roots of similar size to plants grown without As.

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