Periodate, barium potassium

Strontium [7440-24-6] Sr, is in Group 2 (IIA) of the Periodic Table, between calcium and barium. These three elements are called alkaline-earth metals because the chemical properties of the oxides fall between the hydroxides of alkaU metals, ie, sodium and potassium, and the oxides of earth metals, ie, magnesium, aluminum, and iron. Strontium was identified in the 1790s (1). The metal was first produced in 1808 in the form of a mercury amalgam. A few grams of the metal was produced in 1860—1861 by electrolysis of strontium chloride [10476-85-4]. 

The same goes for carbon (the accident was caused because carbon was used instead of manganese dioxide, by mistake), sulphur and phosphorus. There was a detonation with carbon. With phosphorus the detonation occurred once the carbon disulphide used to dissolve phosphorus vapourised red phosphorus behaves the same way. The same happened with the potassium chlor-ate/sodium nitrate/sulphur/carbon mixture, which led to a violent detonation as well as with the potassium perchlorate/aluminium/potassium nitrate/barium nitrate/water mixture. In the last case the explosion took place after an induction period of 24h. 

An aqueous solution of periodic acid, free from metal ions, may be prepared through the conversion of potassium metaperiodate to the slightly soluble barium dimesoperiodate, Ba2l207, which, through reaction with an equivalent amount of sulfuric acid, yields pure periodic acid.107 Hudson found that nitrate as an impurity in periodic acid gives rise to erroneous results in this field.239 ... 

If an alkali periodate be treated with a soln. of a barium salt, C. F. Rammelsberg 14 says that the soln. becomes more and more acid with sodium periodate 2Nal04+2Ba(N03)2+H20=Ba2I209+2NaN03+2HN03 but with potassium dimesoperiodate the soln. remains neutral. The voluminous precipitate soon... 

Hematological Effects. Low serum potassium level was observed in a 22- year-old factory worker accidentally exposed by acute inhalation to barium carbonate powder (Shankle and Keane 1988). Altered hematological parameters were observed in rats following inhalation for an intermediate exposure period to 3.6 mg barium/m as barium carbonate dust (Tarasenko et al. 1977). Reported changes included decreased blood hemoglobin, decreased thrombocyte count, decreased blood glucose, decreased albumin, increased leukocyte count, and increased blood phosphorus. 

Atoms of some elements are relatively easily ionized at flame temperatures. This is particularly true for the alkali and alkaline earth elements, and other elements to the left of the periodic table. The first ionization potentials also tend to be lower for heavier elements within a particular group. For the group 2 elements, for example, ionization follows the order Ba>Sr>Ca>Mg>Be. This would not matter in flame spectrometric analysis, apart from a slight deterioration in sensitivity, if samples and standards were ionized to exactly the same extent. Suppose barium was to be determined in samples containing potassium, however. The potassium would be ionized ... 

Double sulphides of iron and nickel are present in nickel matte, and are hence of commercial importance. Double sulphides with potassium, K2S.3NiS, and barium, BaS.4NiS, may be obtained by fusing nickel, sulphur, and an alkali at a high temperature.8 They are crystalline compounds. Cobalt yields only the sesquisulphide, Co2S3, in like circumstances. Nickel thus resembles palladium and platinum, whilst cobalt resembles rhodium and iridium in these respects. The position of nickel after cobalt in the Periodic Table thus receives further justification. 

Nielsen compared the induction periods observed by various investigators for several precipitates. He reported the induction period for silver chloride to be inversely proportional to the fifth power of the initial concentration after mixing. Similarly, induction periods for silver chromate, calcium fluoride, calcium oxalate, and potassium perchlorate are inversely proportional to the 4.7,9,3.3, and 2.6 powers of the initial concentrations. For barium sulfate, on the other hand, a variety of discordant values has been observed. La Mer summarized the data of two groups of observers, covering a range of concentrations (Figure 8-1). 

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