Determining Minimum Salt Concentration for Human Taste Perception
Freshwater is generally believed to have no taste of salt. This experiment aims to find the minimum concentration of sodium chloride in a water solution that can be detected by humans. Using a double-blind tasting method, the study explores the saltiness threshold and its significance for living organisms. The experiment involves varying salt concentrations in water and observing human perception levels. Understanding this threshold is crucial for various applications, including aquatic habitats and agriculture.
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Problem# 21 Online IYNT Online IYNT 2021 2021 1 IRAN Team IRAN Team
Problem Problem No. No. 21 21 What is the minimum concentration of sodium chloride in water solution such that a human detects the presence of salt? Use double blind tasting in your experiments. 2 IRAN Team IRAN Team
Outline Outline Introduction Observation Questions Theories Experiments Results and conclusions Introduction Introduction Introduction Observation Observation Observation Questions Questions Theories Theories Experiments Experiments Results and conclusions Results and conclusions 3 IRAN Team IRAN Team
4 Introduction Introduction Most people believe fresh water has no taste of salt. So, determining the range that salt can be felt is so important Measuring the salinity or the dissolved salt content of water is important as aquatic organisms, livestock, and crops thrive at different salinity levels. IRAN Team IRAN Team Conclusion Introduction Theories Experiments
6 key words key words & & phrases phrases tongue salinity salinity IRAN Team IRAN Team Conclusion Introduction Theories Experiments
8 Theories Theories Taste Saltiness is a taste produced primarily by the presence of sodium ions. A sodium channel in the taste cell wall allows sodium cations to enter the cell. Hence, the more the salt in water, the more sense of Salinity What is double bind? IRAN Team IRAN Team Conclusion Introduction Theories Experiments
11 Experiments Experiments For this experiment, I used some glasses, a scale and a graduated glass. For this experiment, I used some glasses, a scale and a graduated glass. First, I pour First, I pour 2 2 grams salt in gram, and I continue this with the other amount of salt. gram, and I continue this with the other amount of salt. grams salt in 1 1 liter liter water,then water,then I reduced the amount of salt to I reduced the amount of salt to 1 1 IRAN Team IRAN Team Conclusion Introduction Theories Experiments
12 IRAN Team IRAN Team Conclusion Introduction Theories Experiments
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14 Lastly, 4 persons drunk from each glasses and here is the results: IRAN Team IRAN Team Conclusion Introduction Theories Experiments
15 Conclusion Conclusion Somewhere between Somewhere between 500 taste of salt. taste of salt. 500mg/L and mg/L and 250 250mg/L is the range that people can feel the mg/L is the range that people can feel the According to EPA (Environmental protection agency in USA), In order to avoid According to EPA (Environmental protection agency in USA), In order to avoid adverse effects on taste, EPA recommends that sodium concentrations in adverse effects on taste, EPA recommends that sodium concentrations in drinking water not exceed drinking water not exceed30 30 to to 60 60 mg/L, a threshold for taste mg/L, a threshold for taste- -sensitive segments of the population. Many individuals will not be able to detect the segments of the population. Many individuals will not be able to detect the presence of sodium in this concentration range. presence of sodium in this concentration range. sensitive IRAN Team IRAN Team Conclusion Introduction Theories Experiments
https://www.horiba.com/en_en/water-quality/applications/water- wastewater/measuring-salinity-of-water/ https://www.scientificamerican.com/article/bring-science-home-taste-thresholds/ 18 IRAN Team IRAN Team
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