[1] Hiroshima Univ, Grad Sch Adv Sci & Engn, Transdisciplinary Sci & Engn Program, 1-5-1 Kagamiyama, Hiroshima 7398529, Japan
[2] Minist Nat Resources & Environm, Dongnasok Nong Beuk Rd,POB 7864, Viangchan 0117, Laos
[3] Minist Environm, Dept Hazardous Subst Management, Phnom Penh 120101, Cambodia
[4] Victory Christian Acad, 810 Buena Vista Way, Chula Vista, CA 91910 USA
[5] Hiroshima Univ, IDEC Inst, Ctr Planetary Hlth & Innovat Sci PHIS, 1-5-1 Kagamiyama, Hiroshima 7398529, Japan