A novel power calibration method for microwave digestion system

We determined the mineral nutrients and toxic elements (Ca, Cu, Fe, Mg, Zn, Cd, Cr, Mn, Ni, and Pb) in five types of coffee by atomic absorption spectrometry and inductively coupled plasma mass spectrometry. The decomposition of the samples took place in a microwave digestion system with HNO3 and H2O2 reagents. Partial validation of the method was performed by using the certified reference material (NCS ZC 73014). Univariate and multivariate statistical methods were used to compare both the coffee samples and the techniques used. No significant differences were found between two used methods. Significant differences occurred between the coffee samples but only the application of multivariate statistics helps to distinguish among samples from different locations.

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Robotic microwave digestion system for dissolution of titanium dioxide

The Analyst ◽

10.1039/an9921700003 ◽

1992 ◽

Vol 117 (1) ◽

pp. 3 ◽

Cited By ~ 11

Author(s):

John D. Norris ◽

Brian Preston ◽

Lynn M. Ross

Keyword(s):

Titanium Dioxide ◽

Microwave Digestion ◽

Microwave Digestion System

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Design and Operation of a Capsule-Based Microwave Digestion System

Analytical Chemistry ◽

10.1021/ac9710689 ◽

1998 ◽

Vol 70 (23) ◽

pp. 5029-5036 ◽

Cited By ~ 5

Author(s):

Guy Légère ◽

Eric D. Salin

Keyword(s):

Microwave Digestion ◽

Microwave Digestion System

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BIOMONITORING OF AIR POLLUTION WITH ZINC IN CROATIA STUDIED BY MOSS SAMPLES AND ICP-AES

Contributions Section of Natural Mathematical and Biotechnical Sciences ◽

10.20903/csnmbs.masa.2012.33.1-2.34 ◽

2017 ◽

Vol 33 (1-2) ◽

Author(s):

Ivana Vučković ◽

Zdravko Špirić ◽

Trajče Stafilov ◽

Vladimir Kušan

Keyword(s):

Inductively Coupled Plasma ◽

Microwave Digestion ◽

Anthropogenic Pollution ◽

Atomic Emission ◽

Atomic Emission Spectrometry ◽

Emission Spectrometry ◽

Moss Species ◽

Inductively Coupled ◽

Zn Content ◽

Microwave Digestion System

A b s t r a c t: Samples from different moss species were collected from 121 sampling sites evenly distributed over the territory of Croatia, during the summer and autumn of 2010. Moss samples were totally digested by using microwave digestion system and analysed by using atomic emission spectrometry with inductively coupled plasma (ICP-AES). Descriptive statistics were made from analyses of zinc in all moss samples. The content of Zn varies between 11.6 mg kg–1 and 77.1 mg kg–1. The median value of Zn content is 24.8 mg kg–1 which is similar to the median value obtained in investigation in 2005 (29.0 mg kg–1). Map of distribution of zinc shows the sites of the country with higher levels of this element. High contents of Zn were found in moss samples collected from the vicinity of Sisak, region of Podravina and Rijeka as a result of anthropogenic pollution. By the comparison of median value found in moss samples from neighboring and Balkan countries as well as Norway, it can be noted that the median for Zn in Croatia has the lowest value.

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Mainstream Smoke Collection by Electrostatic Precipitation for Acid Dissolution in a Microwave Digestion System Prior to Trace Metal Determination

Journal of AOAC International ◽

10.1093/jaoac/80.6.1320 ◽

1997 ◽

Vol 80 (6) ◽

pp. 1320-1331 ◽

Cited By ~ 1

Author(s):

Charles B Rhoades ◽

Ralph T White

Keyword(s):

Trace Metal ◽

Graphite Furnace ◽

Microwave Digestion ◽

Emission Spectrometry ◽

Positive Pressure ◽

Mainstream Smoke ◽

Electrostatic Precipitation ◽

Element Determination ◽

Evaporation Chamber ◽

Microwave Digestion System

Abstract A method is described for collection and preparation of mainstream smoke condensate from cigarettes for determination of trace metal constituents. A sample of mainstream smoke was collected from 300 cigarettes in a final volume of 25 mL. Extremely clean laboratory conditions during sample preparation were essential to avoid contamination and improve precision and accuracy for trace element determination. The clean laboratories maintained a positive pressure of HEPA-filtered air with constant temperature and humidity control. Mainstream cigarette smoke was collected by electrostatic precipitation (EP) on a modified rotary smoking machine located in a wooden CORESTA cabinet. The EP unit was equipped with a high tension generator supplying 17.5 kV to a tungsten electrode followed by 2 secondary acid traps. Samples were collected under 2 smoking regimens: FTC (35 mL puff volumes, one puff every 60 s, and puff duration 2 s) and “Extreme” (75 mL puff volumes, one puff every 35 s, puff duration 2 s). Condensate was extracted from collection tubes with methanol into Teflon microwave digestion vessels and evaporated in an environmental evaporation chamber (EEC). The EEC provided an ultraclean environment for sample evaporation and predigestion steps that eliminated most of the sample matrix. The remainder was decomposed in a programmable closed vessel microwave digestion system. Digested sample solutions were analyzed by graphite furnace atomic absorption spectrometry and inductively coupled plasma optical emission spectrometry for aluminum, arsenic, cadmium, chromium, nickel, and silicon.

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Development of a fully automated open vessel focused microwave digestion system

Chemometrics and Intelligent Laboratory Systems ◽

10.1016/0169-7439(93)e0043-4 ◽

1994 ◽

Vol 22 (1) ◽

pp. 37-47 ◽

Cited By ~ 6

Author(s):

Max Feinberg ◽

Carolle Suard ◽

Jayne Ireland-Ripert

Keyword(s):

Microwave Digestion ◽

Microwave Digestion System

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Hardwood pulping kinetics of bulk and residual phases

TAPPI Journal ◽

10.32964/tj14.10.652 ◽

2015 ◽

Vol 14 (10) ◽

pp. 652-662 ◽

Cited By ~ 2

Author(s):

DIEGO ALMEIDA ◽

RICARDO B. SANTOS ◽

PETER W. HART ◽

HASAN JAMEEL

Keyword(s):

Loblolly Pine ◽

Linear Correlation ◽

Microwave Digestion ◽

Eucalyptus Nitens ◽

Fast Heating ◽

Different Temperatures ◽

Kinetics Of ◽

Microwave Digestion System ◽

Syringyl To Guaiacyl Ratio

The kinetics of the bulk and residual delignification phases of Eucalyptus nitens, E. globulus, E. benthamii, acacia, maple, and loblolly pine were determined in an effort to improve the use of various hardwoods. Kinetic experiments were performed using a microwave digestion system for fast heating of the kraft liquor. Delignification rates were obtained for three different temperatures (150°C, 160°C, and 170°C) and correlated with the wood’s syringyl-to-guaiacyl ratio. A linear correlation between the kraft delignification rate and the syringyl-toguaiacyl ratio was found to exist.

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Investigation of Heavy Metal Contamination in Fishes from Passur River near the Sundarbans Mangroves of Bangladesh

Journal of Environmental Science and Natural Resources ◽

10.3329/jesnr.v10i1.34689 ◽

2017 ◽

Vol 10 (1) ◽

pp. 21-24

Author(s):

MS Islam ◽

SC Shil ◽

MH Kabir ◽

ME Hoq

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Metal Contamination ◽

Heavy Metal Contamination ◽

Microwave Digestion ◽

Penaeus Monodon ◽

Aquatic Life ◽

Port Area ◽

The Government ◽

Microwave Digestion System

The study was conducted to investigate the heavy metal contamination in fishes and shrimps from the Passur River near the world famous Sundarban mangroves located in the southwestern part of Bangladesh, during the period from January to June 2013. The fish (Liza parse) and shrimp (Penaeus monodon) samples were collected from two stations as St-1 (Katakhali-1 km upper from port area- upstream) and St-2 (Amtola-1 km lower from port area- downstream) monthly for three months in January (winter), March (pre monsoon) and May (Monsoon). Before analysis, a bit of muscle, the whole liver and two gill arches from each fish and shrimp were removed. Samples of tissues from each fish and shrimp were removed, weighed and dried. A microwave digestion system was used to prepare the samples for analysis. After digestion residue diluted with 25 ml 2.5% HNO3. The water used was deionized and distilled. The metal analyses of samples (Cd, Cr, Cu, Pb and Zn) were carried out by using UNICAM-929 atomic absorption spectrophotometer (AAS) in SGS Bangladesh Limited, Dhaka-1205, Bangladesh. Among the heavy metals studied Cd, Cr, Cu, Pb and Zn were detected in fish and shrimp species were within acceptable limits by FAO standards. The results of this study indicated that a general absence of serious pollution in the Passur River is due to heavy metals; whereas the concentrations of elements found could mainly be attributed to geological sources. In this regard, to maintain the water and sediment qualities as well as the sound and safe aquatic life of the river need proper monitoring and management by the relevant authorities of the Government of Bangladesh.J. Environ. Sci. & Natural Resources, 10(1): 21-24 2017

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