Air pollution control: The evaluation of TerphApm@MWCNTs as a novel heterogeneous sorbent for benzene removal from air by solid phase gas extraction

A new synthesized sorbent based on functionalizing graphene with N-Phenyl-3-aminopropyl trimethoxy silane (G-PhAPTMS, C12H21NO3Si), was developed as a novel sorbent for removal of toluene from air by sorbent gas extraction procedure (SGEP). By proposed method, the removal efficiency of G-PhAPTMS was compared with other sorbents such as activated carbon (AC), graphene (G) and graphene oxide (GO). The standard gas of toluene generated in pure air with different concentrations and the effects of parameters such as temperature (10-90 °C), flow rate (50-500 mL min-1) and the amount of sorbent (2-30 mg) were investigated. According to the results, increasing the flow rate and temperature had negative effects on the removal efficiency of all sorbents. The highest removal efficiency of G-PhAPTMS was obtained up to 35 °C and less than 250 mL min-1 (>95%). In optimized conditions, the amount of sorbent for toluene removal was achieved more than 10 mg of G-PhAPTMS.

Section: Effect Of Temperaturementioning

confidence: 70%

Functionalized graphene-trimethoxyphenyl silane for toluene removal from workplace air by sorbent gas extraction method

Hosseinabadi

Timoori

Zarandi

2019

“…2. Different extraction techniques that can be employed for arsenic extraction before the instrumental analysis [43][44][45][46][47][48][49][50] Fig. 3.…”

Section: Analytical Chemi S Try Methods For the Determination Of Arsenicmentioning

confidence: 99%

A review: Analytical methods and health risk assessment for inorganic, organic, and total arsenic content in rice samples

Hassan,

Koohi,

Amrollahi-Sharifabadi

et al. 2023

Determining the level of contaminants in rice is very important because it is one of the staple foods consumed by most people worldwide. Therefore, the quantity of arsenic in rice has become a health concern because rice cultivars have the property of accumulating arsenic in their grains. As a result, various societies have mandated the measurement of arsenic in rice by using different analytical chemistry methodologies, including atomic absorption spectrometry (AAS, ETAAS, HG-AAS) after sample preparation methods such as solid phase microextraction (SPME) and dispersive liquid-liquid extraction (DLLE). The content of arsenic in rice is an essential prerequisite data to incorporate in the health risk assessment. By having such information, it can be possible to determine the risk ratio calculations and identify which countries produce rice with less risk for human consumption. This review aimed to present the analytical methods used for the analysis of inorganic, organic, and total arsenic contents in rice and introduced the methodology for health risk assessment and its related calculations by using the data of inorganic and total arsenic quantifications in the rice along with the per capita of the consumption of rice.

“…The analysis of solvent extraction is coupled with GC-MS or HPLC. The solvent during extraction is replaced by supercritical fluid (CO 2 ) making it a green approach [124][125][126][127][128]. In addition, the pollutants such as metals and VOCs may be determined in water samples by GC-FID, GC-MS, AAS, and ICP-MS [129][130][131][132].…”

Section: Analysis Of Particulate Mattersmentioning

confidence: 99%

A review: Exploratory analysis of recent advancement in green analytical chemistry application

Kumari,

M. M. A. Alsayadi,

Sharma

2024

It is always a concern to ensure personnel and environment safety in the field of chemistry which has caused to development of green analytical chemistry methods. Green chemistry aims to create an eco-friendly environment in laboratories by using various analytical methods/strategies to reduce the use of toxic solvents which are harmful to humans and the environment. It is a way that protect the environment by using green solvents and methods. Green analytical chemistry is a rapid analytical technique that describes the separation, identification, and quantification of an analyte in drugs, environments, and humans. Various green methodologies such as automation, miniaturization, precipitations, and passivation are utilized in the recovery of solvents and reagents. Green analytical chemistry aims to create an eco-friendly environment in the laboratories by using various analytical methods/strategies to reduce the use of toxic solvents which are harmful to the environment/humans as well as to decrease the amount of waste generated. In this review, we explore different green solvents that can replace other toxic solvents used during extraction processes. In this review, the various extraction methods and analytical techniques used to analyze different components have been discussed.