scholarly journals Simple and convenient analytical method for the direct determination of chlorine species by ETV-ICP-AES using tungsten boat furnace vaporiser and exchangeable small sample cuvettes

2017 ◽  
Vol 59 ◽  
pp. 262-267 ◽  
Author(s):  
Norihisa Kojima ◽  
Yasuhiko Mizoguchi ◽  
Kenji Tanabe ◽  
Yutaka Iida ◽  
Bunji Hashimoto ◽  
...  
Keyword(s):  
Analytical Method ◽  
Direct Determination ◽  
Small Sample ◽  
Tungsten Boat

scholarly journals Fast and Simple Analytical Method for Direct Determination of Total Chlorine Content in Polyglycerol by ICP-MS

Molecules ◽  
2018 ◽  
Vol 23 (2) ◽  
pp. 487 ◽  
Author(s):  
Agata Jakóbik-Kolon ◽  
Andrzej Milewski ◽  
Piotr Dydo ◽  
Magdalena Witczak ◽  
Joanna Bok-Badura
Keyword(s):  
Analytical Method ◽  
Direct Determination ◽  
Chlorine Content ◽  
Simple Analytical Method ◽  
Icp Ms

The Determination of Zinc Oxide in Rubber Vulcanizates by X-Ray Diffraction

1960 ◽  
Vol 33 (3) ◽  
pp. 890-898
Author(s):  
Stephen H. Laning ◽  
Melvin P. Wagner ◽  
John W. Sellers
Keyword(s):  
Zinc Oxide ◽  
Quantitative Analysis ◽  
Analytical Method ◽  
Direct Determination ◽  
Zinc Stearate ◽  
Photographic Film ◽  
Reaction Products ◽  
X Ray

Abstract Zinc oxide is a necessary component in most accelerator-sulfur vulcanization systems. While it is not an accelerator, its presence leads to increased modulus, i.e., tighter cures. The manner in which it can effect this better cure is not completely clear. Some insight into the role of zinc oxide has been gained through the analysis of the vulcanizate for reaction products of zinc, such as zinc stearate, the zinc salts of the accelerators, and zinc sulfide. However, these products may not account for all of the zinc oxide which has reacted. An analytical method for the direct determination of unreacted zinc oxide in vulcanizates was therefore needed. The determination of zinc oxide in rubber vulcanizates has received scant attention. Wet-chemical techniques for analysis of the sample after ashing provide only the total amount of zinc from which the amount of unreacted zinc oxide cannot be determined. Endter has reported the use of the Debye-Scherrer x-ray technique for the identification of zinc oxide in rubber samples. While similar to the method developed in this laboratory, Endter employed photographic film for recording the diffraction pattern, and special sample preparation was required to accommodate the photographic technique. This method was satisfactory for qualitative identification of zinc oxide, but was difficult to use for quantitative analysis. Subsequent to this investigation Hagino et al. described the use of x-ray diffractometry for the determination of the mixing ratio of ingredients compounded in rubber. This method was also suggested for the quantitative analysis of zinc oxide, but no studies were reported. During a study in this laboratory to determine the role of zinc oxide in the vulcanization of rubber, a new analytical method, based on x-ray diffractometry, was developed. The method was rapid, nondestructive, and simple. The data were reliable and accurate.

Direct determination of plasma copper and zinc in infants by atomic absorption with discrete nebulization.

1981 ◽  
Vol 27 (8) ◽  
pp. 1445-1447 ◽  
Author(s):  
T Makino ◽  
K Takahara
Keyword(s):  
Atomic Absorption ◽  
Direct Determination ◽  
Absorption Spectrometry ◽  
Sample Volume ◽  
Reference Intervals ◽  
Small Sample ◽  
Time Saving ◽  
Copper And Zinc ◽  
Plasma Copper

Abstract A new micromethod for the determination of copper and zinc is presented. Sample volumes can be as little as 10 (Cu) and 20 (Zn) microliter of plasma or serum, by using discrete (small sample volume) nebulization in place of conventional nebulization in place of conventional nebulization in atomic absorption spectrometry. The present method has slightly poorer precision than the conventional nebulization method, but has the advantages of requiring commercially available apparatus without any modification, involving simple sample preparation, and being time-saving. Results agree well with those by the trichloroacetic acid deproteinization method. In addition, this method is useful for pediatric samples, and we report reference intervals for full-term and premature infants, as well as adults.

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