A SINGLE REAGENT FIELD TEST FOR QUATERNARY AMMONIUM SOLUTIONS

1952 ◽  
Vol 15 (1) ◽  
pp. 27-28 ◽  
Author(s):  
Dwight B. Conklin
Keyword(s):  
Organic Solvent ◽  
Quaternary Ammonium ◽  
Test Method ◽  
Bromphenol Blue ◽  
Blue Color ◽  
Simple Test ◽  
Test Kit ◽  
Food And Beverage ◽  
Service Conditions ◽  
Quaternary Complex

A test method is described for the verification of proper use concentrations of solutions of straight quaternary ammonium rinses or formulated detergent-quaternary preparations. The simple test kit and direct procedure afford an economical and easily used test method for the sanitarian and the food and beverage worker. The estimation of the quaternary concentration is accomplished by the reaction of the quaternary with a definite amount of bromphenol blue accurately buffered on the acid side. The blue color of the dye-quaternary complex is dominant if 200 ppm. or more of quaternary is present in the solution. If less than 200 ppm. quaternary is present various shades of green are produced by the partial conversion of the dye to its blue complex plus the acidified yellow excess. The test reagent may be used with many proprietary preparations after the dye demand of the specific quaternary at the recommended use concentration is established. The test described is simpler than related methods in eliminating use of an organic solvent and in its wide adaptability to service conditions. It is simple and accurate and economical enough to encourage greater use of controlled solutions.

scholarly journals Preparation of Isotopically Labelled Standards of Creatinine Via H/D Exchange and Their Application in Quantitative Analysis by LC-MS

Molecules ◽  
2020 ◽  
Vol 25 (7) ◽  
pp. 1514
Author(s):  
Remigiusz Bąchor ◽  
Andrzej Konieczny ◽  
Zbigniew Szewczuk
Keyword(s):  
Internal Standard ◽  
Test Method ◽  
Simple Test ◽  
Liquid Chromatography Mass Spectrometry ◽  
Creatinine Concentration ◽  
Back Exchange ◽  
Acidic Conditions ◽  
Facile Preparation ◽  
The Stability ◽  
Neutral Conditions

Kidneys play a crucial role in maintaining metabolic homeostasis in a body. Serum creatinine concentration is a simple test used as an indicator of renal function. One of the known ways of quantifying creatinine concentration is the liquid chromatography-mass spectrometry (LC-MS) method, using an isotopically labeled analog of creatinine as an internal standard. Unfortunately, such isotope-labeled analogs are expensive and their synthesis is complex. Here we demonstrate a facile preparation of deuterated analogues of creatinine, via the H/D exchange of hydrogens located at the α-carbon (α-C) of the N-methylated amino acid part, under basic conditions. The stability of retrieved isotopologues was analyzed under both neutral or acidic conditions, and the results revealed that the introduced deuterons do not undergo back-exchange. In addition, the coelution of deuterated and non-deuterated forms under acidic and neutral conditions was observed. The prepared isotopologues were successfully applied in the quantitative LC-MS analysis of urine samples, and the results demonstrated that the presented strategy is novel and inexpensive, and that the quantification correlates with the commonly used Jaffe test method.

Evaluating Thermal Expansion Coefficient of SiC Coatings by Relative Method

2017 ◽  
Vol 726 ◽  
pp. 110-114
Author(s):  
Rui Na Pan ◽  
Chen Guang Wei ◽  
Yi Wang Bao ◽  
De Tian Wan ◽  
Yan Ping Wang
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Ceramic Coatings ◽  
Test Method ◽  
Experimental Results ◽  
Simple Test ◽  
Relative Method ◽  
Novel Method ◽  
Sic Coatings

A simple test approach named relative method is developed for determining the thermal expansion coefficient of ceramic coatings. Although ceramic coatings are hardly separated from the substrates, it was evaluated in this work simply by need only the measured thermal expansion coefficient of coated samples and substrates. This novel method was demonstrated to be valid for rectangular beam samples of two types of coating configurations: sandwich coating and around coating. The feasibility of this test method was confirmed by experimental results of SiC coating.

Simple Test Method for Squeak & amp; Rattle Evaluation of Door Trim by Using Statically Repeated Loading Robot Arm

2009 ◽  
Author(s):  
Hyunchul Lee ◽  
Hyunmin Park ◽  
Hyunghyun Na ◽  
Jongsoo Kim ◽  
Ohhwan Jeon ◽  
...  
Keyword(s):  
Test Method ◽  
Repeated Loading ◽  
Robot Arm ◽  
Simple Test

Study on Vibration Properties of Fresh Concrete with Simple Test Method

2015 ◽  
Vol 1110 ◽  
pp. 267-270
Author(s):  
Yuji Yamada ◽  
Shinichiro Hashimoto ◽  
Chikanori Hashimoto ◽  
Takeshi Watanabe ◽  
Shigeyuki Date
Keyword(s):  
Fly Ash ◽  
Fresh Concrete ◽  
Experimental Methods ◽  
Vibration Characteristics ◽  
Test Method ◽  
Simple Test ◽  
Slump Test ◽  
Vibration Properties ◽  
Alternative Test ◽  
Alternative Test Method

It has been reported that, depending on the material used, batches of concrete having the same slump value behave differently when vibrated. It is therefore to be expected that batches of concrete having the same slump value and containing the same amount of powder will have different properties depending on the material used. However, these batches of concrete are treated as concrete of the same quality since, at present, no alternative test method has yet been established as a substitute for the slump test. This study proposed new simplified experimental methods for vibration properties of fresh concrete. By using these methods, the vibration characteristics of fresh concrete containing fly ash (FA) and containing a large amount of cement were exhibited.

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