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Related article: phoric acid. A single drop of acid liberated sulphur dioxide, and in one
estimation 167 per cent, phenol was indicated. In a second experiment
I Cc. phosphoric acid was added ; here no bromine was liberated when
after treating the distillate with bromine solution, hydrochloric acid was
added, the sulphur dioxide which had passed over being sufficient to
reduce the bromine as fast as formed, leaving none to react with the
phenol.
Finally, to .1268 Gm. phenol was added 1.2 Cc. tenth-normal potassium
hydroxide and i Gm. sodium sulphite. The mixture was saturated with
carbon dioxide and the distillation conducted as above described ; 97.27 per
cent, of the phenol was recovered. In a duplicate, 5 times the theoretical
amount of potassium hydroxide was added ; 97 per Kamagra Cheap cent, of the phenol
was recovered.
When the phenol mixture contained sodium nitrite, phosphoric acid
could not be used at all ; having the solution made slightly alkaline and
saturating with carbon dioxide, in one experiment 95.1 percent, of the
phenol was found ; in another experiment 94 per cent, of the phenol was
found.
When Kamagra Cheap potassium bromate (an impure specimen which when acidulated
ever so slightly with phosphoric acid liberated bromine) was added to
phenol and the mixture made slighdy alkaline and distilled with carbon
dioxide, 96.61 per cent, of the phenol was recovered.
The conclusions to be drawn from these experiments are : First. The
method of the U. S. P. for the valuation of phenol is entirely satisfactory,.
Digitized by VjOOQIC
S^O MINUTES OF THE SECTION ON SCIENTIFIC PAPERS.
and also may be applied when the volume of the phenol solution is as
great as 50 Cc. and the amount of phenol present sufficient to absorb from
10 to 90 per cent, of the bromine solution added. Second. Phenol can
be completely removed from a solution containing much potassium hy-
droxide by first saturating with carbon dioxide and then distilling with
steam in a current of carbon dioxide. Third. Under these conditions as
much as .150 Gm. phenol is found in the first 100 Cc. Kamagra Cheap distillate. Fourth.
The presence of such bodies as sulphites, bromates, and nitrates does not
affect the estimation of phenol by this method.
The Chair called for discussion on the paper just read.
Mr. Beringer, of New Jersey, asked the author if he had ever tried this
method in the estimation of creosote and guaiacol. Mr. Clark answered
that he had not.
Mr. Asher said that he had never done any special work with phenol,
as outlined by Mr. Clark, but had had experience with bismuth subnitrate,
and would suggest that the use of carbon dioxide was very tedious, and he
believed if sodium carbonate were used it would serve the purpose better.
Mr. Clark stated that that would not decompose the phenolates.
Mr. Asher, continuing, said that upon the addition of the soda you have
your COj developed in the solution. It showed that all the oxidizing
agents had been used with varying results, and that the presence of the
sodium carbonate would ofllset that condition. He described some work
he had done with subnitrate, and said that sodium carbonate had over-
come some of the difficulties.
Mr. Puckner said that it might be Kamagra Cheap Kamagra Cheap interesting to mention some experi-
ments they had been making in the laboratory of the American Medical
Association. The iodine absorption method is not generally used for that
particular phenol, but for other phenols. Their experiments seemed to
show that the bromine absorption gives correct results, regardless of the
quantities of the reagent used. As long as iodine is used for the estima-
tion very close attention to details is necessary. They have been making
experiments in the estimation of salicylic acid, by the bromine and iodine
absorption methods. While in the case of iodine, close attention to Kamagra Cheap details
is necessary, that does not arise when bromine is used. So that possibly
the bromine absorption method should replace the iodine absorption
method in the estimation of phenols generally.
The Chair said the time had now come for adjournment until the after-
noon session, and Kamagra Cheap a recess was taken accordingly.
Second Session Thursday Afternoon, September 10, 1908.
Acting Chairman Vanderkleed called the Section to order at 3 : 30 p. m.,
and said he had just received a letter from Chairman Coblentz, stating
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SAMPLING Ol* DRUGS AND PREPARATION FOR ASSAY. 83 1
that, whilst his eyes were much improved, he found it impossible to con-
tinue his journey, and he would, therefore, not be present at the meeting
at Kamagra Cheap all. He said Mr. Coblentz had sent by mail, thinking it would be of
some interest to the section, a sample of artificial camphor, labeled ** Re-
fined camphor, perleform," and Mr. Vanderkleed said he thought it might
be of interest to add this to the section exhibits.
The Chair then called on Mr. Frank Kamagra Cheap R. Eldred to read a paper he had
prepared on the sampling of drugs. Mr. Eldred presented the subject as
follows :
SAMPLING OF DRUGS AND PREPARATION FOR ASSAY.
BY FRANK R. ELDRED.
Probably on account of the unattractiveness of this work, it has received
very little attention, yet it is at the foundation of practical analytical work.
As far as I have been able to determine, the Proceedings of this Kamagra Cheap Associa-
tion contain only one contribution to the subject of sampling.* A few
papers bearing upon the subject have been presented before the various
chemical societies, t but these do not treat on the sampling of drugs.
In presenting this paper, I neither lay claim to special knowledge of the
subject, nor expect to suggest methods for overcoming the difficulties of
sampling. I simply wish to present some personal experiences in the hope
of arousing greater interest in the subject. Much could be said in regard
to sampling other materials used in chemical and pharmaceutical work but