microwave digester Articles
-
Microwave-assisted oxidative digestion of lignin with hydrogen peroxide for TOC and color removal
Dilute lignin solution was successfully digested into colorless and clarified liquor under microwave-assisted oxidative digestion with hydrogen peroxide. High dosage of hydrogen peroxide is needed to effectively digest lignin, but excessive hydrogen peroxide may lead to recondensation of formed fragments in digested lignin. Microwave irradiation greatly facilitates the oxidative digestion of ...
-
Determination of antimony in bottled water and polyethylene terephthalate bottles: a routine laboratory quality check
The paper describes a modified and optimised conventional wet ashing method for the determination of antimony (Sb) in polyethylene terephthalate (PET) bottles used for bottling sparkling and still water. The modified optimum conventional wet ashing method was applied as the digestion method to extract Sb from PET bottles, and the extracted Sb analysed using flame atomic absorption spectrometry ...
-
Microwave Digestion Method Applied to Alumina Samples
Aluminum oxide has high thermal and chemical stability, and can be used for high-temperature insulation, making heat shields or protective coatings. When making other materials, the purity of alumina should be very high, and the impurity elements of the material have a great influence on the performance of the final product. When analyzing trace elements in alumina, the most important step is ...
-
Assisting microwave digestion systems with Automation for Associated sample workup tasks
Microwave-assisted sample digestion techniques excel in decomposing tough samples completely by raising the temperature of reagents higher than the boiling point. The key to increasing the boiling point of reagents is their entrapment in Teflon® lined close digestion vessels. The usual digestion process starts with the samples being weighed in Teflon® liners and digestion reagents added ...
-
Microwave digestion – EPA method 3052 on the Multiwave 3000
Microwave sample preparation provides an efficient and clean sample preparation for multi-element analytical techniques such as ICP-OES and ICP-MS. As Microwave assisted digestion has evolved, so have the methodologies. EPA method 3052 is designed for the “total” analysis in a variety of matrices including soil, sediments, sludge, oils, biological and botanical materials. This method ...
-
A Dynamic Site Investigation: Adaptive Sampling and Analysis Program for Operable Unit 1 at Hanscom Air Force Base, Bedford, Massachusetts
Abstract In this study, field analytical instrumentation and methods were used to support a risk assessment study at the airfield at Hanscom Air Force Base (HAFB, Bedford, Massachusetts). The site investigation is part of an ongoing effort to determine contaminant risk to ground water from soil. The field tools supported a dynamic workplan/adaptive sampling and analysis demonstration. Over a ...
-
Determination of arsenic in baby foods and fruit juices by GFAAS
The United States does not have specific regulations specifying the allowable levels of toxic elements in foods, but many other countries do. For example, Canada has a specific tolerance level for arsenic of 0.1 ppm in ready to serve fruit juices, nectars, and beverages1. The toxic nature of arsenic is such that chronic exposure to the element can lead to internal cancers of the bladder and ...
-
Phytoremediation of chromium from tannery wastewater using local plant species
Phytoremediation, which is an emerging technology for cleaning up contaminated sites, is cost effective and has aesthetic advantages and long term applicability. The technology involves efficient use of plant species to remove, detoxify or immobilize contaminants in a growth matrix (soil, water or sediments) through natural processes. For this study, swamp smartweed (Polygonum coccineum), ...
-
Simultaneous Determination of Pb, Cd, Cr, Ni, and Cu in plants using microwave digestion and graphite furnace AAS
The determination of lead, cadmium, chromium, nickel, and copper in plants is part of several biological monitoring programs. Monitoring these elements is important in order to observe and document the damage on plants caused by environmental pollution. The samples consist of leaves and needles collected from different types of trees. These trees are selected species monitored over a long period ...
-
Comprehensive review and compilation of pretreatments for mesophilic and thermophilic anaerobic digestion
Organic matter hydrolysis prior to anaerobic digestion has been shown to improve biogas production (30–50%) and reduce solids (20–60%) by ultrasound, chemical, conventional heating, and microwave pretreatments. Numerous studies have been performed to determine the extent of digestion improvement but few focus on financial feasibility of these processes. A comprehensive model was created using ...
-
op Precautions you Must Follow when Handling Corrosive Chemicals in the Lab
If you’ve been a part of the scientific community for a long time, we don’t need to tell you that there is an extensive list of precautions you must follow when handling chemicals in a lab. However, if you’re relatively new or could use some brushing up, give this article a read. We highlight key precautions you should follow when handling corrosive chemicals in the lab. ...
-
A fuzzy rule–based approach for modelling effects of bench–scale microwave pre–treatment on solubilisation and anaerobic digestion of secondary sludge
Fuzzy rule–based models were proposed in order to predict the effect of microwave pretreatment on the waste activated sludge (WAS) solubility and anaerobic digestibility or biogas production. The developed models were trained and validated using the experimental data from two separate multilevel factorial designs, containing 24 solubilisation and 54 biogas production runs from batch mesophilic ...
-
From Mining to High-Purity Metals
From Mining to High-Purity Metals: Efficient Ways for Elemental Analysis In terms of elemental analysis, the mining value chain has vastly different requirements. During early exploration and exploitation mostly major contents of elements in raw materials need to be determined. In later process stages – for example during production of high-purity metals and alloys – trace and ...
-
How to Improve the Sensitivity, Long-Term Stability and Throughput of your ICP-MS
More Performance for your ICP-MS ICP-MS (inductively coupled plasma mass spectrometry) is a widely used technology for analytical chemistry. Their multi-element detection capability, the lowest detection limits in the ppb-ppq area, and their versatility make ICP-MS systems the ideal analytical instruments for an incredible range of applications. Whether in the environmental sector, food ...
-
Application Fields and Main Functions of Spectrophotometer
UV Vis spectrophotometer is widely used in pharmaceutical, medical and health, chemical industry, energy, machinery, metallurgy, environmental protection, geology, food, biology, materials, agriculture, forestry, fishery and many other industries, in higher education, metrology science and research institutes. It plays an important role in the fields of teaching, scientific research, quality ...
-
Sample Handling Strategies for Accurate Lead-In-Soil Measurements in the Field and Laboratory
ABSTRACT The inhomogenous lead-in-soil matrix can present serious obstacles to accurate sample collection and handling. In typical lead-in-soil measurement, particle size related errors in sampling and sample handling often exceed all other sources of error. The magnitude of error can vary widely depending on the particulate nature of the lead contaminant and the effectiveness of control ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you