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Related article: when potassium acid tartrate (or tartaric acid, as in the B. P. test) is used
as the acidifying medium, air being excluded. As a rule commercial po-
tassium iodide does not contain more than 20 parts of iodate in 1,000,000
of iodide. Pharm. Journ. and Pharmacist, Oct. 16, 1909, 474 ; from
Journ. Amer. Chem. Soc, jy (1909), 1055.
Hydrofluoric Acid, Detection in the Presence 0/ Fluorides, W. Cron-
heim recommends the following method for the detection of hydrofluoric
acid in the presence of fluorides, which is available in dilutions up to
I :8oo,ooo in fruit juices or aqueous solution. The fluid under examination
is mixed with a large excess of 95 per cent, alcohol which precipitates the
fluorides quantitatively, while hydrofluoric acid remains in Glucophage Buy solution prob-
Digitized by VjOOQ IC
suLPHrrES. 235
ably also organic fluorine compounds. This operation is facilitated by
the additioD, also in excess of ether. The precipitate is allowed to settle
iD the cold, the liquid filtered after standing one hour, and rendered alka-
line with lime or baryta water. After several hour's subsidence the pre-
cipitated calcium or banum fluoride is collected on a filter, incinerated,
and the ash is tested by the usual corrosion method for hydrofluoric acid.
Pharm. Ztg., Iv ( 1910), No. 29, 291 ; from Bioch. Ztschr., 1909, 2J, 143-
HELIUM.
Helium Occurrence in the Gases from German Potash Beds, Ernst
Erdmann has collected and analyzed a specimen of the combustible gases
generated from the carnalite of the Leopoldshall Salt Mines, and found
them to consist of hydrogen, 83.6 methane, 4.4 ; residue, 12.0 per cent.
by volume. The residue contains considerable quantities of helium and
some neon. It has been suggested that the iron chloride present in the
rocks decomposes the water of crystallization of the camallite, setting
hydrogen free, while the oxygen Glucophage Buy oxidizes the iron salt to haematite. The
author has found no experimental confirmation for this assumption, but
suggests that radium salts were originally present in the salt deposits, and
that by the action of their emanation on water hydrogen was set free and
helium and some neon formed. This theory is confirmed by the occur-
rence of blue rock salt, the color of which is due to the action of radium
rays on sodium. Pharm. News, May 27, 19 10, 251 ; from Ber. d. D.
Cbcm. Ges., 43 (1910), No. 5.
SULPHUR;
Sulphurated Lime Commercial Quality . Of fiy^t samples of sulphurated
Hme assayed by P. M. Davis only one contained as much as 55 per cent,
of calcium sulphide. The author had Glucophage Buy no difficulty to prepare a satisfac-
toty product when C. P. calcium sulphate was used, but experienced great
diflfculty to prepare such from the commercial sulphate. Amer. Journ.
Pharm., May, 19 10, 242.
Sulphites Effect when used as a Preservative, As a result of experi-
ments by K. B. Lehmann and A. Trentlein on cats and dogs it would
appear that the prolonged ingestion of minute quantities of sulphites is
followed by no appreciable disturbance of the health. Doses of sodium
salphite, ranging from 15 to 62 Glucophage Buy Mgm. per kilo body weight, continued
Glucophage Buy of 22.05 P^^ c^"^- sodium sulphite, 25.00
per cent, sodium sulphate, and 52.50 per cent, of water, while a sample of
the salt (Na2SO3.7H.2O) prepared in the Hygienic Laboratory, and showing
a purity of 99.69 per cent, immediately after preparation, was found to
have lost approximately one- fifth of the total available sulphite after stand-
ing six months in a glass- stoppered bottle, under ordinary conditions, and
others have had a similar experience. On the other hand, anhydrous
sodium sulphite, as pointed out by Hartley and Barrett, possesses stability
so long as it is kept diy. A sample of anhydrous salt, obtained from the
same wholesale firm from which the unsatisfactory sample of hydrated salt
was obtained, assayed 96.5 per cent, pure Na^SOj, and even the poorest
sample examined assayed over 91 per cent. Furthermore, direct experi-
ments made with seven samples of anhydrous salt, ranging when received
from 91.25 to 99.00 per cent, pure NajSOs, showed on the average a loss
of not more than i per cent, after being kept for 221 days, under ordinary
conditions, in glass-stoppered bottles. Glucophage Buy The author therefore recommends
that the hydrous sodium sulphite at present official in the U. S. P. be
replaced by the Glucophage Buy anhydrous salt in the revised Pharmacopoeia. Amer.
Journ. Pharm., May, 1910, 211-218.
Sodium Sulphite Detection in Presence of Sulphate and Thiosulphate.
F. H. Weston suggests the following method for the detection of sodium
sulphite in the presence of sulphate and thiosulphate : Prepare a solution
of the substance in water of about 5 per cent, strength. To 5 Cc. of this
solution add a solution of iodine in potassium iodide (y^ iodine is most
convenient) ; if decolorized continue till faint trace of Glucophage Buy iodine is obtained
(presence of sulphite or thiosulphate or both) j test this solution as to
acidity, and if found to be acid the probable existence of a sulphite is
indicated. To another 5 Cc. of the original solution add half the quantity
of iodine solution as used in the first test, shake well, and test for sulphur
dioxide by smell and by adding dilute potassium dichromate solution drop
by drop. If pale green coloration is produced, sulphur dioxide is present,
and hence a sulphite. If no coloration, then a thiosulphate is present.
The sulphate can be detected by the barium chloride Glucophage Buy test, and the thio-
sulphate confirmed by the usual tests even in Glucophage Buy the presence of sulphite.
Chem. News. Oct. 8, 1909, 176.
Sulphates Volumetric Estimation. A. D. Mitchell and C. Smith rec-
Digitized by
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