The ammoniac is considered as the most toxic fraction of TAN that is defined by the sum of ammonium ion
and ammoniac (EPA, 1998).
(2001), when both nitrogen sources ([NH.sup.+.sub.4] e [NO.sup.-.sub.3]) are provided, the activity of the reductase enzyme of the nitrate is significantly increased, indicating a certain stimulatory action of the ammonium ion
in the enzyme activity, a fact which justifies the higher total number of seeds (Figure 5C) obtained in the proportion of 150:50 of N-[N.sub.4]: N-[NH.sup.+.sub.4].
In literature, similar data are reported for ammonium ion
diffusion in a cylindrical pellet of [(N[H.sub.4]).sub.4]Fe[(CN).sub.6]x1.5[H.sub.2]O by Gawad and Bhat  using the isothermal transient ionic current method, D = 3.87 x [10.sup.-7] [cm.sup.2]/s.
Although [T.sub.5%] of complex C2 is lower, compared to C1, it is still higher for 50 [degrees]C than other [Eu.sup.3+]tetrakis complexes with [beta]-diketone ligands and quaternary ammonium ions
This is due to the selectivity of ammonium ions
Ma et al., "Adsorption characteristics of ammonium ion
by zeolite 13X," Journal of Hazardous Materials, vol.
As can be seen from Table 5, the efficiency of ammonium ion
removal from the samples decreased from 91 to 73% after half an hour.
Nitrate show the same spatial variation as the ammonium ion
. For against nitrate levels are between 1.46 and 7.69 mg/l, but these values are low compared to the extent of pollution in the region If the mineralization clues reflect the influences Mentioned Above, Those of organic pollution ([BOD.sub.5], COD and [O.sub.2]) give an idea of the organic load discharged.
A yellow solid compound 2, one equivalent of 4,4'- biphenylcarboxaldehyde 3 and ammonium ion
in acetic acid as solvent was mixed and the content of reaction mixture was refluxed for 3 hours with continous stirrering (scheme-1).
Despite relatively large emissions of man- made acidic ions being entered in atmosphere, the alkaline nature of rainwater suggests dominance of neutralizing compounds like calcium, magnesium and ammonium ion
In polymer-ammonium salt system, proton ([H.sup.+]) was identified as charge species that responsible for ionic conduction to take place which was originated from ammonium ion
, N[H.sub.4.sup.+] [28,29].