scholarly journals The Determination of the Amount of Oxygen in Molten Copper-Nickel and Copper-Silver Alloys by the EMF Method

1971 ◽  
Vol 44 (10) ◽  
pp. 2706-2709 ◽  
Author(s):  
Iwao Tsukahara
Keyword(s):  
Molten Copper ◽  
Emf Method ◽  
Silver Alloys ◽  
Copper Nickel

DETERMINATION OF COPPER, NICKEL AND CHROMIUM CONTENTS IN CULTIVATED TEA IN NORTH OF IRAN

2015 ◽  
Vol 14 (10) ◽  
pp. 2409-2413
Author(s):  
Amir Hossein Mahvi ◽  
Azita Mohagheghian ◽  
Sakineh Shekoohiyan ◽  
Ali Koolivand ◽  
Shahrokh Nazmara ◽  
...  
Keyword(s):  
Copper Nickel ◽  
North Of Iran ◽  
Determination Of Copper

scholarly journals Cost-effective Method of Analysis for the Determination of Cadmium, Copper, Nickel and Zinc in Cocoa Beans and Chocolates

2014 ◽  
Vol 4 (1) ◽  
pp. 193 ◽  
Author(s):  
Gideon Ramtahal ◽  
Ivan Chang Yen ◽  
Isaac Bekele ◽  
Frances Bekele ◽  
Lawrence Wilson ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Reference Materials ◽  
Certified Reference Materials ◽  
Control Sample ◽  
Cost Effective ◽  
Cocoa Beans ◽  
Copper Nickel ◽  
Flame Atomic Absorption

<p>The determination of heavy metals in cocoa beans and chocolates is of great importance, due to increasingly stringent regulations being implemented by international legislative bodies and chocolate manufacturers, to protect the health of their consumers. While various techniques exist for heavy metal analyses in cocoa, this study developed a cost-effective, accurate and precise method capable of processing up to 120 samples per batch for the determination of cadmium, copper, nickel and zinc. For sample extractions, a normal laboratory hot plate and locally fabricated high-capacity digestion blocks were used, instead of dedicated block digestion or microwave digestion systems. In addition, only concentrated nitric acid was used, instead of mixed reagents used in standardized methods, for metal extractions from samples, with a sample: extractant ratio of 0.5 g : 10 mL, digestion at 130 ºC, followed by filtration and analysis by flame atomic absorption spectrophotometry. The method was validated with Certified Reference Materials, with heavy metal recoveries generally &gt;95%. Additionally, an in-house quality control sample of ground cocoa nib analyzed together with the Certified Reference Materials was used to monitor the consistency of analyses of heavy metals in cocoa bean samples.</p>

Determination of Hydrogen in Molten Copper and Copper-tin Alloy by a Hot Extraction Technique

1967 ◽  
Vol 31 (10) ◽  
pp. 1149-1153 ◽  
Author(s):  
Shigeo Oya ◽  
Eiichi Kato ◽  
Hideya Shimizu ◽  
Takayasu Takada
Keyword(s):  
Molten Copper ◽  
Extraction Technique
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