Simultaneous determination of cobalt, copper, iron and vanadium in crude petroleum oils by HPLC

1996 ◽  
Vol 43 (7-8) ◽  
pp. 431-432 ◽  
Author(s):  
S. N. Lanjwani ◽  
K. P. Mahar ◽  
A. H. Channer
Keyword(s):  
Simultaneous Determination ◽  
Crude Petroleum ◽  
Cobalt Copper ◽  
Petroleum Oils

scholarly journals Simultaneous Determination of Arsenic, Cadmium, Calcium, Chromium, Cobalt, Copper, Iron, Lead, Magnesium, Manganese, Molybdenum, Nickel, Selenium, and Zinc in Fertilizers by Microwave Acid Digestion and Argon Inductively Coupled Plasma-Optical Emission Spectrometry Detection: Single-Laboratory Validation, First Action 2017.02

2018 ◽  
Vol 101 (2) ◽  
pp. 383-384 ◽  
Author(s):  
Sharon F Webb
Keyword(s):  
Simultaneous Determination ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Previous Method ◽  
Emission Spectrometry ◽  
Inductively Coupled ◽  
Lead Magnesium ◽  
Single Laboratory ◽  
Cobalt Copper

Abstract A single-laboratory validation method for the simultaneous determination of nutrient and non-nutrient metals in commercial fertilizers was reviewed by the AOAC Expert Review Panel (ERP) and Stakeholder Panel for Fertilizers at the 2017 midyear AOAC INTERNATIONAL meeting. In addition to using 15 of the original 30 fertilizer materials from the previous Method 2006.03 collaborative study, NIST Standard Certified Reference Material 695 and Magruder check sample 2009-06 were also incorporated as accuracy, recovery, and repeatability materials. Method 2017.02 is suitable for the simultaneous determination of arsenic, cadmium, calcium, chromium, cobalt, copper, iron, lead, magnesium, manganese, molybdenum, nickel, selenium, and zinc in all major types of commercial fertilizer products by microwave digestion and inductively coupled plasma-optical emission spectroscopy analysis. With recoveries ranging from 92.8 to 103.2% for analytes above the LOQs, improved RSDs, and enhanced efficiency as compared with the previous method, Method 2006.03, the ERP recommended this method for First Action Official MethodsSM Status.

Simultaneous Determination of Arsenic, Cadmium, Calcium, Chromium, Cobalt, Copper, Iron, Lead, Magnesium, Manganese, Molybdenum, Nickel, Selenium, and Zinc in Fertilizers by Microwave Acid Digestion and Inductively Coupled Plasma-Optical Emission Spectrometry Detection: Single-Laboratory Validation of a Modification and Extension of AOAC 2006.03

2014 ◽  
Vol 97 (3) ◽  
pp. 700-711 ◽  
Author(s):  
Sharon Webb ◽  
James Bartos ◽  
Rhonda Boles ◽  
Elaine Hasty ◽  
Ethel Thuotte ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Validation Study ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Acid Digestion ◽  
Inductively Coupled ◽  
Lead Magnesium ◽  
Single Laboratory ◽  
Cobalt Copper

Abstract A single-laboratory validation study was conducted for the simultaneous determination of arsenic, cadmium, calcium, cobalt, copper, chromium, iron, lead, magnesium, manganese, molybdenum, nickel, selenium, and zinc in all major types of commercial fertilizer products by microwave digestion and inductively coupled plasma-optical emission spectroscopy analysis. This validation study proposes an extension and modification of AOAC 2006.03. The extension is the inclusion of calcium, copper, iron, magnesium, manganese, and zinc, and the modification is incorporation of hydrochloric acid in the digestion system. This dual acid digestion utilizes both hydrochloric and nitric acids in a 3 to 9 mL volume ratio/100 mL. In addition to 15 of the 30 original validation materials used in the 2006.03 collaborative study, National Institute of Standards and Technology Standard Reference Material 695 and Magruder 2009-06 were incorporated as accuracy materials. The main benefits of this proposed method are a significant increase in laboratory efficiency when compared to the use of both AOAC Methods 965.09 and 2006.03 to achieve

A general computer program for the extended plate overlap algorithm

1978 ◽  
Vol 48 ◽  
pp. 287-293 ◽  
Author(s):  
Chr. de Vegt ◽  
E. Ebner ◽  
K. von der Heide
Keyword(s):  
Computer Program ◽  
Simultaneous Determination ◽  
General Computer Program ◽  
General Computer

In contrast to the adjustment of single plates a block adjustment is a simultaneous determination of all unknowns associated with many overlapping plates (star positions and plate constants etc. ) by one large adjustment. This plate overlap technique was introduced by Eichhorn and reviewed by Googe et. al. The author now has developed a set of computer programmes which allows the adjustment of any set of contemporaneous overlapping plates. There is in principle no limit for the number of plates, the number of stars, the number of individual plate constants for each plate, and for the overlapping factor.

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