FIDAYANA, Ristia Asri; WIRAWAN, Teguh; PANGGABEAN, Aman Sentosa. VALIDATION OF ION SELECTIVE ELECTRONIC METHODS AT PUPUK KALIMANTAN TIMUR COMPANY FOR DETERMINING AMMONIA LEVELS (NH3) IN AMBIENT AIR. JURNAL KIMIA MULAWARMAN, [S.l.], v. 19, n. 1, p. 1-7, nov. 2021. ISSN 2476-9258. Available at: <https://jurnal.kimia.fmipa.unmul.ac.id/index.php/JKM/article/view/842>. Date accessed: 15 mar. 2025. doi: https://doi.org/10.30872/jkm.v19i1.842.