Sustainable Education with Local-Wisdom Based Natural Reagent for Green Chemical Analysis with a Smart Device: Experiences in Thailand

To minimize chemical waste and protect the environment, our team has used green analysis
with natural reagents. In this work, we designed a natural-reagent assay kit for iron determination
and implemented it in chemistry education in Thailand. The iron assay method was adapted
from Thai local wisdom of testing water quality using guava leaves. The guava leaf powder served
as a natural reagent in the assay. The kit included equipment, standard and buffer solutions and a
manual. A smart device with a built-in camera was used as a detector. Educators in six universities
in Thailand implemented the kit in laboratories with modifications depending on their learning
outcomes. The kit implementation was evaluated using a survey with questions in four aspects:
usability, learning achievement, green chemistry and portability. The high average scores for all
questions (> 4.00 of 5.00 points), with the average overall score of 4.53 ± 0.60, indicated satisfaction
regarding in all aspects. Using a locally available bio-resource as a natural reagent for green analysis
in chemistry education supported sustainable education in Thailand, in terms of quality education
(SDG 4) and reduced inequalities (SDG 10) and environmental sustainability (SDG 6—Clean water
and sanitation, 12—Responsible consumption and production and 14—Life be-low water).