scholarly journals From Sophisticated Analysis to Colorimetric Determination: Smartphone Spectrometers and Colorimetry

Author(s):  
Volkan Kılıç ◽  
Nesrin Horzum ◽  
Mehmet Ertugrul Solmaz
1959 ◽  
Vol 36 (2) ◽  
pp. 193-201 ◽  
Author(s):  
Julius A. Goldbarg ◽  
Esteban P. Pineda ◽  
Benjamin M. Banks ◽  
Alexander M. Rutenburg

Author(s):  
Martin Weiser

The position of law in North Korean politics and society has been a long concern of scholars as well as politicians and activists. Some argue it would be more important to understand the extra-legal rules that run North Korea like the Ten Principles on the leadership cult as they supersede any formal laws or the constitution.1 But the actual legal developments in North Korea, which eventually also mediate those leading principles and might even limit their reach, has so far been insufficiently explored. It is easy to point to North Korean secrecy as a main reason for this lacuna. But the numerous available materials and references on North Korean legislation available today have, however, not been fully explored yet, which has severely impeded progress in the field. Even publications officially released by North Korea to foreigners offer surprisingly detailed information on legal changes and the evolution of the law-making institutions. This larger picture of legal developments already draws a more detailed picture of the institutional developments in North Korean law and the broad policy fields that had been regulated from early on in contrast to the often-assumed absence of legislation in important fields like copyright, civil law or investment. It also shows that different to a monolithic system, various law-making institutions exist and fulfil discernably different legal responsibilities. Next to this limitation in content, scholars in the field currently also have not used all approaches legal developments in the North Korea could be analysed and interpreted with. Going beyond the reading of legal texts or speculating about known titles of still unavailable legislation, quantitative approaches can be applied ranging from the simple counting of laws to more sophisticated analysis of legislative numbering often provided with legislation. Understanding the various institutions as flexible in their roles and hence adoptable to shifts in leadership and policy agendas can also provide a more realistic picture of legal practices in North Korea.


2013 ◽  
Vol 12 (7) ◽  
pp. 460-465
Author(s):  
Sameer Amereih ◽  
Zaher Barghouthi ◽  
Lamees Majjiad

A sensitive colorimetric determination of fluoride in drinking water has been developed using a polymeric zirconium complex of 5-(2-Carboxyphenylazo)-8-Hydroxyquinoline as fluoride reagents. The method allowed a reliable determination of fluoride in range of (0.0-1.5) mg L-1. The molar absorptivity of the complex formation is 7695 ± 27 L mol-1 cm-1 at 460 nm. The sensitivity, detection limit, quantitation limit, and percentage recovery for 1.0 mg L-1 fluoride for the proposed method were found to be 0.353 ± 0.013 μg mL-1, 0.1 mg L-1, 0.3 mg L-1, and 101.7 ± 4.1, respectively.


Author(s):  
Abbas Shebeeb Al-kadumi ◽  
Sahar Rihan Fadhel ◽  
Mohammed Abdullah Ahmed ◽  
Luma Amer Musa

We proposed two simple, rapid, and convenient spectrophotometric methods are described for the determination of Amoxicillin in bulk and its pharmaceutical preparations. They are based on the measurement of the flame atomic emission of potassium ion (in first method) and colorimetric determination of the green colored solution for manganite ion at 610 nm formed after reaction of Amoxicillin with potassium permanganate as oxidant agent (in the second method) in basic medium. The working conditions of the methods were investigated and optimized. Beer's law plot showed a good correlation in the concentration range of 5-45 μg/ml. The detection limits and relative standared deviations were (2.573, 2.814 μg/ml) (2.137, 2.498) for the flame emission photometric method and (1.844, 2.016 μg/ml) (1.645,1.932) for colorimetric methods for capsules and suspensions respectively. The methods were successfully applied to the determination of Amoxicillin in capsules and suspensions, and the obtained results were in good agreement with the label claim. No interference was observed from the commonly encountered additives and expectancies.


1939 ◽  
Vol 131 (1) ◽  
pp. 309-315
Author(s):  
P. Arne Hansen ◽  
Verner Nielsen

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