Terbium nitrate hexahydrate

All the chemicals were of analytical
grade and were used without further purification; yttrium nitrate
hexahydrate (Y(NO₃)₃·6H₂O, 99.89%),
gadolinium nitrate hexahydrate (Gd(NO₃)₃·6H₂O, 99.89%), and terbium nitrate hexahydrate (Tb(NO₃)₃·6H₂O, 99.89%), PEI (with M_w = 25 000 and M_n =
10 000), TNP, 2,4-DNT, 2,6-DNT, 2,4-DNP, RDX, phenylalanine,
cysteine, isoleucine, tryptophan, glutamic acid, aspartic acid, lysine,
histidine, and glutamine were purchased from Sigma-Aldrich Inc. TNT
and RDX were purchased from HEMRL, Pune. NaCl, Na₂HPO₄, NaH₂PO₄, Na₂CO₃, NaHCO₃, and NaOH were received from Thomas Baker. NH₄F was received from Merck. Dextrose, glucose, sucrose, fructose,
lactose, and maltose were received from Himedia laboratories Pvt.
Ltd. 1,3-DNB, 4-NP, 2,4-DNB, NM, 4-NT, NB, copper oxychloride, cypermethrin,
malathion, fenvelerate, carbendazim, and chloropyrifos were purchased
from a local company and used as received. Ethanol was obtained from
Hayman Ltd. Deionized water was used throughout the experiments.

All the chemicals were
of analytical grade and were used without further purification. Yttrium
nitrate hexahydrate (Y(NO₃)₃·6H₂O, 99.89%), gadolinium nitrate hexahydrate (Gd(NO₃)₃·6H₂O, 99.89%), and terbium nitrate hexahydrate
(Tb(NO₃)₃·6H₂O, 99.89%) were
purchased from Sigma-Aldrich Inc. Sodium chloride (NaCl, 99.9%) and
potassium permanganate (KMnO₄, 99.0%) were received from
Thomas Baker. Ammonium fluoride (NH₄F, >95%) and sodium
nitrate (NaNO₃, >99%) were received from Merck. The
graphite
powder was obtained from Loba Chemie. PEI (with M_w = 25 000 and M_n =
10 000), MWCNT, and COOH-MWCNT were received from Sigma-Aldrich
Inc. Deionized (DI) water was used throughout the experiments.