By Hugh Warwick
Notice the various wonders of the hedgehog: a humorous, fascinating creature of the geographical region. wearing its secrets and techniques underneath patterned spinesand roaming our fields, parks and gardens, why is it that the hedgehog fascinates such a lot of people? In A Prickly Affair, Hugh Warwick - lifestyles member of the British Hedgehog upkeep Society - explores the quirky humour, false impression and affection that characterises our emotions for this marvellous beast, going all out to provide an explanation for the attraction of the hedgehog. even though hedgehog psychics and the overseas Hedgehog Olympics might be an excessive amount of even for him...
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Additional resources for A Prickly Affair: The Charm of the Hedgehog
DAVID: Emission and Atomic Absorption Spectrochemical Methods. sodium filter transmitting calcium light is overcome by the addition of aluminium chloride to the sample solution which suppresses calcium emission. £. DAVID, 1958). Since the quality of filters varies from one make of flame photometer to another, it is advisable to test them for transmission of light other than that of the element sought before use in analysis. 5 ml of concentrated sulphuric acid. If charring occurs when the nitric acid is driven off, the flask is removed from the heater, cooled, a few ml more of nitric acid added and the flask returned to the heater.
Calibration curves are set up using the measurements on the standards and the concentrations of the element to be determined in the sample solutions read off. Most investigation to date (October, 1960) into atomic absorption analysis has been carried out using apparatus assembled in the laboratory from components now in commercial production, the names of the + manufacturers of which are given in the text of this secA tion. It is likely, however, that the range of components, complete instruments and manufacturers of them will increase considerably in the near future.
02 M hydrochloric acid. The resulting solution is filtered through Pyrexglass-wool to remove any suspended matter before flame emission measurement is carried out on it. m. magnesium as MgC1 2 . The stock magnesium chloride solution for these standards should be prepared by dissolving clean magnesium ribbon in hydrochloric acid. Its magnesium concentration should be checked gravimetrically before use. After switching on the detecting and measuring equipment of the spectrophotometer, the flame is lit and the oxygen and acetylene flow rates to it adjusted to give a partly incandescent flame having a yellowish-white zone (due to incandescent carbon particles) of height 45 mm.