title: Metal-induced decomposition of perchlorate in pressurized hot water.
abstract: Decomposition of perchlorate (ClO(4)(-)) in pressurized hot water (PHW) was investigated. Although ClO(4)(-) demonstrated little reactivity in pure PHW up to 300°C, addition of zerovalent metals to the reaction system enhanced the decomposition of ClO(4)(-) to Cl(-) with an increasing order of activity of (no metal)≈Al < Cu < Zn < Ni << Fe: the addition of iron powder led to the most efficient decomposition of ClO(4)(-). When the iron powder was added to an aqueous ClO(4)(-) solution (104 μM) and the mixture was heated at 150°C, ClO(4)(-) concentration fell below 0.58 μM (58 μg L(-1), detection limit of ion chromatography) in 1 h, and Cl(-) was formed with the yield of 85% after 6 h. The decomposition was accompanied by transformation of the zerovalent iron to Fe(3)O(4). This method was successfully used in the decomposition of ClO(4)(-) in a water sample contaminated with this compound, following fireworks display at Albany, New York, USA.
authors: Department of Chemistry, Kanagawa University, 2946 Tsuchiya, Hiratsuka 259-1293, Japan. h-hori@kanagawa-u.ac.jp
authors: Hisao
authors: H
authors: Hori
authors: Takehiko
authors: T
authors: Sakamoto
authors: Takashi
authors: T
authors: Tanabe
authors: Miu
authors: M
authors: Kasuya
authors: Asako
authors: A
authors: Chino
authors: Qian
authors: Q
authors: Wu
authors: Kurunthachalam
authors: K
authors: Kannan
mesh_terms: D052203:Ferrosoferric Oxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D010472:Perchlorates / Q000737:chemistry*; D011312:Pressure; D013696:Temperature; D014867:Water / Q000737:chemistry*
chemical_list: D008670:Metals; D010472:Perchlorates; D014867:Water; D007501:Iron; C494474:perchlorate; D052203:Ferrosoferric Oxide