Acid cont hydrochloric

Hydrochloric Acid (cont) 40 15-25 9 Resistant little or no change in weight small effect on mechanical properties generally suitable for practical use... 

Hydrochloric Acid (cont) 30 60 30 5 Limited absorption or attack possible stress crack agent... 

Hydrochloric Acid (cont) 50 180 4 15-30% loss in property values minor chemical attack... 

Hydrochloric Acid (cont) >2 23 365 3 Not resistant may be used under certain conditions for brief contact Grilamid Emser Specimen 1 mm (0.039 in) thick samples, valid for filled and unfilled products... 

Hydrochloric Acid (cont) 2 23 4 Some attack or considerable absorption may be suitable for limited exposure... 

Hydrochloric Acid (cont) 20 100 2 Not resistant after a short time, the material is seriously affected (considerable reduction of the mechanical strength and changes in weight) using the material under these conditions is not recommended... 

Hydrochloric Acid (cont) concentrated 100 2 Not recommended Zytel 42 A DuPont... 

Hydrochloric Acid (cont) 10 23 28 9 Plastic was unaffected for duration of test... 

Hydrochloric Acid (cont) 10 50 7 7 Clouded white 1 110 Chemical resistance per ASTM D543 K Resin KR03 Phillips... 

Hydrochloric Acid (cont) 37 9 Acceptable no effect PVC type 1 BITS... 

Hydrochloric Acid (cont) with 10% dichloroethane 90 180 8 Satisfactory no significant change in weight and tensile properties Unstressecd specimen Foraflon Atochem Specimen Samples according to ASTM D 1708, measured to ISO 4433... 

Having accomplished the homogenization of the sample, extraction of free amino acids is usually a simple process of stirring the sample in an appropriate solvent. This is typically a dilute solution (0. IN) of hydrochloric acid (2,7). Elevated temperatures may be used to assist dissolution, but care must be taken not to damage the more acid-labile amino acids. More recently, Moret and Conte (8) report that 0.1N HC1 was not a suitable solvent for all types of food samples. For some types of meat samples, 5% trichloroacetic acid is reported to afford superior performance (for biogenic amines, also amino acids ). It is not unusual to see perchloric acid employed for extraction from meat tissues (also more commonly for biogenic amines). 

A solution containing 22 grams of y>aminophenylarsenoxidc and 18 15 grams of arsenic trichloride in 100 c.c. of methyl alcohol is slowly added to a well-coolestannous chloride in 200 c.c. of hydrochloric acid (density 1 19) and 200 c.c. of methyl alcohol. The product is brownish-yellow and cont ns 45 per cent, of arsenic. It is soluble in hot dilute hydrochloric acid and in moist pyridine, the acid solution yielding precipitates with dilute sulphuric acid and excess of sodium hydroxide. 

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