Joint International Conference on Long-term Experiments ...

3./ RESULTS AND DISCUSSIONS
From the 16 analyzed batches (8 in unit A and 8 in unit B), in 8 of them (3 batches from
unit A and 5 batches from unit B) one highlighted exceedings of the maximum admitted
limits of the physical-chemical parameters, according to the stipulations of STAS
5386/86.
From the 178 draws performed in the 2 units, a number of 37 of them responded
positively as a result of the physical-chemical examination to the following parameters:
the easily hydrolysable nitrogen, the ammoniac in free-state, the sulphurated hydrogen
and the pH.
In table 1 the results obtained as a result of performing the physical-chemical
examination of the samples of whole fresh raw material fish.
As a result of the performed physical-chemical examinations one obtained 37
positive samples from the 178 analyzed (20.78% in the two units with a contamination
rate of 17.58% in 16/91 samples) in unit A and 24, 13% (21/87 samples in unit B (Table
1).
Predominant were exceedings of the maximum limits for the easily hydrolysable
nitrogen, which were recorded in 12 of the 178 analyzed samples (6, 74%) in the two
units, followed by values above the allowed limits of the pH in 9 of the analyzed
samples (5, 05%) and positive results of the Nessler reaction in 10 samples (5, 61%) and
of the reaction for highlighting H2S in 5 samples (2,8%).
In 6 of the 16 batches one did not record exceedings of the maximum allowed
limits for the physical-chemical parameters, according to the stipulations of STAS
5386/86 (batches 1A, 4A, 6A, 7A, 4B and 6 B).
The inadequate results of the physical-chemical parameters of freshness obtained
as a result of performing the laboratory examinations corroborate with the results of the
organoleptic examination of the batches of fresh raw material fish.
Table 1: The results of the physical-chemical examination of the batches of fresh raw
material fish
Crt. Batch 2A Batch 3A Batch 5A Batch 1B Batch 2B Batch 5B
No. NH3 pH NH3 pH NH3 pH NH3 pH NH3 pH NH3 pH
1. 39 7,1 41,9 7,3 51,9 7,6 52,3 7,7 52,0 7,6 51,4 7,5
(the values above the maximum allowed limits of the NH3 and pH parameters)
4./ CONCLUSIONS
As a result of the physical-chemical determinations performed for the samples of fresh
raw material fish one recorded exceedings of the maximum allowed limits for the easily
hydrolysable nitrogen, pH, positive results of the Nessler reaction and of the reaction for
highlighting H2S (sulphurated hydrogen).
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