Catalytic spectrophotometric determination of Mn(II) at trace levels using Celestine blue-KIO4-1,10-phenantroline redox reaction

A new kinetic method has been developed for the measurement of Mn(II) in water samples. The method is based on the catalytic effect of Mn(II) with the oxidation of Celestine blue (CB+) by KIO4 using 1,10-phenantroline (Phen) as an activator. The optimum conditions obtained are pH 4.5, 0.1 M acetate buffer solution, 4.0 x 10-4 M KIO4, 4.5 x 10-5 M CB+, 1.0 x 10-4 M Phen, reaction temperature 40 °C and reaction time of 4.0 min at 640 nm. Under the optimized conditions, the method allowed the measurement of Mn(II) in a range of 0.1-5.0 μg L-1 with a detection limit of 0.023 μg L-1. The recoveries in measuring the standard Mn(II) solutions of 0.5, 2.0 and 4.0 μg L-1 were in the range of 97-103%, and the relative standard deviations (RSDs) were in a range of 3.0-0.8%. The method was applied satisfactorily to the determination of Mn(II) in some environmental water samples. The reliability of method was also verified by determining the manganese content of the certified standard reference river water sample, JAC-0031. Compared with the previously published catalytic-kinetic methods and instrumental methods, the method showed fairly good selectivity and sensitivity, low cost, cheapness, low detection limit and rapidity. It can easily and successfully be applied to the natural water samples.KEY WORDS: Mn(II), Kinetic-spectrophotometry, Catalytic effect, 1,10-Phenantroline, Celestine blue Bull. Chem. Soc. Ethiop. 2011, 25(3), 333-346.

Determination of attitudes towards healthy eating of students studying at the school of physical education and sports: Beden eğitimi ve spor yüksekokulunda öğrenim gören öğrencilerin sağlıklı beslenmeye ilişkin tutumlarının belirlenmesi

The aim of this study is to determine the attitudes of students studying at Hatay Mustafa Kemal University, School of Physical Education and Sports, towards healthy eating. 213 students participated in the study voluntarily. Students' Attitudes towards Healthy Eating Scale was used to determine the students' attitudes towards healthy eating. SPSS 26 package program was used to analyze the data. Independent T-test was used in pairwise comparisons and One Way ANOVA test was used to determine the difference between groups. No difference was found in the comparison of students' attitudes toward healthy eating according to gender and age variables. It was determined that the 4th-grade students in the class variable and the coaching department students in the department variable had higher attitudes toward healthy eating. As a result, it was concluded that the SBITS scores of the students of the School of Physical Education and Sports were in the high category. It is thought that the contributions of individuals who will especially teach and coach in their professional lives will be positive in raising students and athletes. (Extended English summary is at the end of this document) Özet Bu çalışmanın amacı Hatay Mustafa Kemal Üniversitesi Beden Eğitimi ve Spor Yüksekokulunda öğrenim gören öğrencilerin sağlıklı beslenmeye ilişkin tutumlarının belirlenmesidir. Çalışmaya 213 öğrenci gönüllü olarak katılmıştır. Öğrencilerin sağlıklı beslenmeye ilişkin tutumlarının belirlenmesinde öğrencilerin Sağlıklı Beslenmeye İlişkin Tutum Ölçeği (SBİTÖ) kullanılmıştır.  Veri analiz etmek için SPSS 26 paket programı kullanılmıştır. İkili karşılaştırmalarda Independent T testi, gruplar arası farkın belirlenmesinde ise One Way ANOVA testi kullanılmıştır. Öğrencilerin sağlıklı beslenmeye ilişkin tutumlarının cinsiyet ve yaş değişkenine göre karşılaştırılmasında fark saptanmamıştır. Sınıf değişkeninde 4. sınıfların ve bölüm değişkeninde ise antrenörlük bölümü öğrencilerinin öğrencilerin sağlıklı beslenmeye ilişkin tutumlarının daha yüksek olduğu tespit edilmiştir. Sonuç olarak, Beden Eğitimi ve Spor Yüksekokulu öğrencilerinin SBİTÖ puanlarının yüksek kategoride olduğu sonucuna ulaşılmıştır. Meslek hayatlarında özellikle öğretmenlik ve antrenörlük yapacak bireylerin öğrenci ve sporcu yetiştirirken katkılarının olumlu yönde olacağı düşünülmektedir

Determination of athlete nutrition knowledge level of university students: Üniversite öğrencilerinin sporcu beslenme bilgi düzeylerinin belirlenmesi

The aim of the study is to determine the athlete nutrition knowledge level of the students educated at Hatay Mustafa Kemal University School of Physical Education and Sports. A total of 286 students, 156 male, and 130 female, between the ages of 18-25 participated in the study voluntarily. The Sports Nutrition Knowledge Questionnaire (NSKQ) was used to determine the athletes' nutrition knowledge levels of the students. The Independent T-test was used to compare the groups, and the One-Way ANOVA test was used to determine the difference between the departments. As a result of the analysis, both men and women were in the weak knowledge group in the classification of nutritional knowledge. No difference was found in the comparison of the nutritional knowledge scores according to the gender variable. In the comparison of the nutritional knowledge scores according to the status of taking a nutrition course, a significant difference was determined for both the total score and the sub-variables (weight control, macronutrients, micronutrients, sports nutrition, supplement, alcohol), and it was determined that the difference was in favor of the students who took the nutrition course. It was determined that this difference was in favor of the students who took nutrition lessons. It was also determined that there was a significant difference in the sub-dimension of macronutrients in the comparison of sports nutrition knowledge scores according to the departments, and the difference was in favor of the department of recreation. When comparing the nutritional knowledge scores of male and female students according to the department variable, it was determined that there was a difference in the sub-dimension of macronutrients and this difference was in favor of the department of recreation in men and in favor of teaching department students in women. As a result, it was revealed that the nutritional knowledge level of the students in the School of Physical Education and Sports was weak. In their professional lives, it is thought that increasing the hours of compulsory nutrition lessons will be beneficial for education to be at the desired level in nutrition. ​Extended English summary is in the end of Full Text PDF (TURKISH) file.   Özet Çalışmanın amacı Hatay Mustafa Kemal Üniversitesi Beden Eğitimi ve Spor Yüksekokulunda (BESYO) eğitime-öğrenim gören öğrencilerin sporcu beslenme bilgi düzeylerinin belirlenmesidir.   Çalışmaya 18-25 yaş arası 156 erkek, 130 kadın olmak üzere toplam 286 öğrenci, gönüllü olarak katılmıştır. Öğrencilerin sporcu beslenme bilgi düzeylerinin belirlenmesi için Sporcu Beslenme Bilgisi Ölçeği (SBBÖ) kullanılmıştır. Grupların karşılaştırılmasında Independent T testi, bölümler arasında farkın belirlemesinde ise One Way ANOVA testi kullanılmıştır. Analiz sonucunda hem erkekler hem de kadınlar beslenme bilgi sınıflandırılmasında zayıf bilgi grubunda yer almışlardır. Cinsiyet değişkenine göre beslenme bilgi puanlarının karşılaştırılmasında fark saptanmamıştır. Beslenme bilgi puanlarının beslenme dersi alma durumuna göre karşılaştırılmasında, hem toplam puan hem de alt değişkenler (ağırlık kontrolü, makro besin öğeleri, mikro besin öğeleri, sporcu beslenmesi, supleman, alkol) için anlamlı fark belirlenmiş, farkın beslenme dersi alan öğrenciler lehine olduğu tespit edilmiştir. Bölümlere göre sporcu beslenme bilgi puan karşılaştırılmasında makro besin öğeleri alt boyutunda anlamlı fark olduğu farkın rekreasyon bölümü lehine olduğu tespit edilmiştir. Erkek ve kadın öğrencilerin bölüm değişkenine göre beslenme bilgi puan karşılaştırılmasında makro besin öğeleri alt boyutunda fark olduğu farkın erkeklerde rekreasyon kadınlarda ise öğretmenlik bölümü öğrencileri lehine olduğu tespit edilmiştir. Sonuç olarak, BESYO’da öğrencilerin beslenme bilgi düzeylerinin zayıf olduğu, mesleki hayatlarında beslenme konusunda istenilen seviyelerde olmaları için zorunlu beslenme dersi saatlerinin arttırılmasının eğitime faydalı olacağı düşünülmektedir

A reliable method of quantification of trace copper in beverages with and without alcohol by spectrophotometry after cloud point extraction

A new cloud point extraction (CPE) method was developed for the separation and preconcentration of copper (II) prior to spectrophotometric analysis. For this purpose, 1-(2,4-dimethylphenyl) azonapthalen-2-ol (Sudan II) was used as a chelating agent and the solution pH was adjusted to 10.0 with borate buffer. Polyethylene glycol tert-octylphenyl ether (Triton X-114) was used as an extracting agent in the presence of sodium dodecylsulphate (SDS). After phase separation, based on the cloud point of the mixture, the surfactant-rich phase was diluted with acetone, and the enriched analyte was spectrophotometrically determined at 537 nm. The variables affecting CPE efficiency were optimized. The calibration curve was linear within the range 0.285-20 µg L-1 with a detection limit of 0.085 µg L-1. The method was successfully applied to the quantification of copper in different beverage samples

Determination of sodium and potassium in certified rock samples by AES after ultrasonic leaching

In order to evaluate the data obtained by atomic emission spectrometric analysis after ultrasonic extraction, destructive analysis of some certified rock samples employing ultrasonic waves was applied to two elements, Na and K, and the recovery rates were defined. The recovery ratio as K1 = CULM/CCRM was defined for the ultrasonic leaching method (CULM) and the certified reference materials (CRMs). Another recovery ratio, K2 was also defined from the results of the conventional dissolution method (CCDM), that is K2, CULM/CCDM. The accuracy and precision of the method were comparable with those of the conventional methods. The obtained recoveries were between 90.0 % < K1,Na < 106.1 and 90.0 % < K2,Na < 103.0 % for Na and 92.3 % < K1,K < 103.2 and 92.3% < K2,K < 104.5% for K. It was shown that ultrasonic extraction can be effectively used for analytical sample preparation purposes