J. Technology and Education, Vol.23, No.2, pp.51-56 (2016)






1 東京工業高等専門学校 物質工学科 (193-0997 八王子市椚田町1220-2)

2 有限会社 坂本石灰工業所 (〒865-0013 玉名市下273-1

3 熊本高等専門学校 生物化学システム工学科 (〒866-8501 八代市平山新町2627



Development of a device to easily detect lead pollution in the soil

by a colorimetric method and the improving the detection limitation

by using RGB(red-green-blue) values


Ryo SHOJI1*, Akiko TOKUNAGA1, Mika SUZUKI1, Tatsunobu SAKAMOTO2, Yasunori TAKAKI2, Hitomi FUKAURA2 and Reiko WAKASUGI3

1 National Institute of Technology, Tokyo College (1220-2 Kunugida, Hachioji, Tokyo 193-0997 Japan)

2 Sakamoto Lime Industry Co., Ltd. (273-1 Shimo, Tamana, Kumamoto 865-0013 Japan)

3 National Institute of Technology, Kumamoto College (2627 Hirayamashinmachi, Yatsushiro,

Kumamoto 866-8501 Japan)


Received January 25, 2016; Accepted August 26, 2016)



In Japan, soil pollution by heavy metals has been one of the most serious environmental problems. Some studies have shown that conventional methods of detecting metal pollution in soil show promising sensitivity. However, the methods are not easily employed for on-site evaluation, requiring much time and cost. In this study focusing on colorimetric method, we have successfully developed an easily used and handy device for the evaluation of lead pollution in soil. In addition, the detection limitations can be improved using RGB values as the quantitative evaluation for colorization induced by lead pollution. The device developed in this study was applied to four simulated soils contaminated by lead. Although the device can detect lead pollution in real contaminated soils, the color induced by lead-binding was dependent on the size of the soil particles.


Key words : Lead / soil / easy / RGB / size distribution