Thermodynamic parameters of inorganic Pyrophosphatase in marshland south of Iraq

Abstract EN

Marsh land (south of Iraq) is of great international interest at present time.

Studying some microbial Properties including enzyme activities, can be useful as indicator of soil quality of this area.

General conclusion of enzyme reaction in soil can be reached from the thermodynamic parameters of the enzyme_soil system.

Hence , this experiment was conducted to study thermodynamic parameters ( Q10 , Ea , ?Ha , ?Sa and ?Ga ) for inorganic pyrophosphatase enzyme in this soil as compared with their counter parts of other soils of south of Iraq ( Al-Zubair and Abul-Khasib soils ).

Results indicated that Q10 and ?Ga values of marsh land did not significantly differs from other soils under study with average values of about 1.11 and 14.55 KJmol -1 , respectively.

Ea values of marsh land, Al-Zubair and Abul-Khasib soil were 8.72, 7.47 and 9.53 KJmol -1, respectively.

? SA values for marsh land soil 10.49-) J deg -1 mol -1) were lower than those of Abul-Khasib (–7.85 J deg -1 mol -1) but higher than those of Al- Zubair (–14.55J deg -1 mol -1).

?Ha values were in order of Abul-Khasib ( 12.08 KJmol -1 ) > marsh land ( 11.27 KJmol -1 ) > Al-Zubair soil ( 10.02 KJmol -1).