At-Home Laboratory Experiments for the Analytical Chemistry Curriculum

Autor/inn/en	Ambruso, Kelly; Riley, Kathryn R.
Titel	At-Home Laboratory Experiments for the Analytical Chemistry Curriculum
Quelle	In: Journal of Chemical Education, 99 (2022) 2, S.1125-1131 (7 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Riley, Kathryn R.)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0021-9584
DOI	10.1021/acs.jchemed.1c00943
Schlagwörter	COVID-19; Pandemics; Science Laboratories; Laboratory Experiments; Science Experiments; Chemistry; Undergraduate Students; College Science; Online Courses; Distance Education; Telecommunications; Technology Uses in Education; Handheld Devices; Spectroscopy; Interpersonal Relationship + Suchen Sie Ihr Suchwort? Laboratory work; Laborarbeit; Chemie; Online course; Online-Kurs; Distance study; Distance learning; Fernunterricht; Telekommunikationstechnik; Technology enhanced learning; Technology aided learning; Technologieunterstütztes Lernen; Spektroskopie; Interpersonal relation; Interpersonal relations; Interpersonelle Beziehung; Zwischenmenschliche Beziehung
Abstract	In this communication, we describe five at-home laboratory experiments and demonstrations that complement a semester-long analytical chemistry curriculum. The experiments were successfully carried out by remote undergraduate students enrolled in a hybrid analytical chemistry course during the COVID-19 pandemic. Students used their personal smartphones to perform the spectrophotometric analyses and all other materials needed to carry out the experiments were assembled in a homemade laboratory kit with a total cost of 265 USD (with the potential for additional cost savings). The experiments centered on the analysis of a single analyte, Allura Red food dye, and spanned quantitative analysis by absorption spectroscopy, reverse-phase liquid chromatography, fluorescence quenching, and Brownian motion. Students used external calibration and the method of standard additions to determine the concentration of Allura Red in maraschino cherry juice to be 140 ± 40 and 130 ± 40 ppm, respectively. Students' results were within the expected concentration range of 100-150 ppm. Qualitative spectroscopic and chromatographic analyses spurred robust discussion of the chemical principles underpinning the analytical techniques. Independent remote laboratory instruction was supported through weekly laboratory group meetings involving the remote students and course instructor. Group meetings enabled remote students to make connections with other students in the course, troubleshoot their data analysis in real-time with peer and instructor support, and reflect more deeply on their experimental work. Details about the kit contents, experimental results, best practices for implementation, and recommendations for future adaptation are described. (As Provided).
Anmerkungen	Division of Chemical Education, Inc. and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2024/1/01