INDEX Acid suits

Linseed is one of the few vegetable sources of the omega 3 class of essential fatty acids, hence it is ideally suited for this type of product. The combination of linseed and soya produces a bread that has a low glycemic index, which is another bonus for this sort of product. This reduced glycemic index makes the product more attractive to slimmers and diabetics. 

A suite of both oxidized and reduced iron minerals has been found as efflorescences and precipitates in or near the acid mine water of Iron Mountain. The dominant minerals tend to be melan-terite (or one of its dehydration products), copiapite, jarosite and iron hydroxide. These minerals and their chemical formulae are listed in Table III from the most ferrous-rich at the top to the most ferric-rich at the bottom. These minerals were collected in air-tight containers and identified by X-ray diffractometry. It was also possible to check the mineral saturation indices (log Q(AP/K), where AP = activity product and K = solubility product constant)of the mine waters with the field occurrences of the same minerals. By continual checking of the saturation index (S.I.) with actual mineralogic occurrences, inaccuracies in chemical models such as WATEQ2 can be discovered, evaluated and corrected (19), provided that these occurrences can be assumed to be an approach towards equilibrium. 

The most frequently used detector in FI systems with gas-diffusion separation is the spectrophotometer. Quite often the gas-diffusion process offers sufficient selectivity to allow relatively non-specific chemical reactions in the acceptor stream to detect the analyte. Thus, carbon dioxide, sulfur dioxide, hydrogen sulfide, ammonia may all be determined using suitable acid-base indicators in appropriate buffer solutions used as the acceptor streams. The concentration of the buffer solutions may be adjusted to suit a certain concentration range for the analyte. In order to further enhance the selectivity and/or sensitivity more specific reagents may be introduced in the acceptor streams. In the previously mentioned example on the determination of cyanide [20] a modified pyrazolone-isonicotinic acid reaction was used for such purposes. Interferences due to Schlieren effects seem not to have been reported in gas diffusion spectrophotometric systems. This is understandable, since the matrix composition of acceptor streams is usually quite uniform, and the refractive index is little affected after absorbing the gaseous analytes. 

The separation of bile acids by gas-liquid chromatography is determined by the choice of stationary phase and bile acid derivative. Data that permit the selection of stationary phase and bile acid derivative to suit most separation problems are shown in Tables XII-XIV. As in the original papers relative retention times have been used in the tables instead of the more acceptable retention index (112) which permits better interlaboratory comparisons. Relative retention times are subject to variation, mainly due to temperature differences and, to a lesser extent, to differences in column preparation. In our experience the temperature-dependence is most pronounced with trimethylsilyl ether derivatives on Hi-Eff-8B (cyclohexanedimethanol succinate) columns. Temperature differences do not affect relative retention times on QF-1 (a trifluoropropyl, methyl siloxane) to the same extent. 

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