Metals, tests for

Klebsiella pneumoniae, reveled itself the most resistant species to all of the metals tested. For example the MIC in solid medium of Klebsiella pneumoniae to HgCL and AgN03 is 2400 pM, that of Pseudomonas putida to CdCl2 is 4000 pM and that of Enterobacter agglomerans to Cr(N03)3 is 8000pM. 

Creep Properties of Adhesives in Shear by Compression Loading (Metal-to-Metal), Test for (D 2293)... 

Among the noble metals tested for oxygen reduction in acidic electrolytes are Ag, Au, Pd, Rh, Ir, and Ru [34, 41, 42]. However, none of them was able to compete with Pt in terms of activity, and it is stiU a matter of debate whether Au nanoparticles reduce oxygen in a two- or a four-electron reduction. However, recently some Pd alloys have been shown to exhibit activities similar to those of Pt. 

Besides large-diameter pipes, ultrasonic testing is used for checking the welded joints of drill bits, components of wind-driven electric plants, welded joints of light alloys and non-metallic materials, for an integrated inspection of various objects. A range of training aids developed at the Institute allows the operators to be trained effectively. 

An important application of the HMT is the test for ferrous inclusions in high pressure turbine disks made from a non-magnetic metal alloy. On principle, such ferrous inclusions can be introduced during the manufacturing process and, if present, they can be the origin of cracks in these most critical parts. Therefore such tests are stringent necessary. 

Halogens can act as ligands and are commonly found in complex ions the ability of fluorine to form stable complex ions with elements in high oxidation states has already been discussed (p. 316). However, the chlorides of silver, lead(Il) and mercury(l) are worthy of note. These chlorides are insoluble in water and used as a test for the metal, but all dissolve in concentrated hydrochloric acid when the complex chlorides are produced, i.e. [AgCl2] , [PbC ] and [Hg Clj]", in the latter case the mercury(I) chloride having also disproportionated. 

Most nitrocompounds react vigorously with metallic sodium during the tests for elements present (p. 321). 

Fire-Resistant Hydraulic Fluids. Fire-resistant hydrauhc fluids are used where the fluid could spray or drip from a break or leak onto a source of ignition, eg, a pot of molten metal or a gas flame (17). Conditions such as these exist in die-casting machines or in presses located near furnaces. Specific tests for fire resistance are conducted by Factory Mutual in the United States. 

Alkali or alkaline-earth salts of both complexes are soluble in water (except for Ba2[Fe(CN)g]) but are insoluble in alcohol. The salts of hexakiscyanoferrate(4—) are yellow and those of hexakiscyanoferrate(3—) are mby red. A large variety of complexes arise when one or more cations of the alkah or alkaline-earth salts is replaced by a complex cation, a representative metal, or a transition metal. Many salts have commercial appHcations, although the majority of industrial production of iron cyanide complexes is of iron blues such as Pmssian Blue, used as pigments (see Pigments, inorganic). Many transition-metal salts of [Fe(CN)g] have characteristic colors. Addition of [Fe(CN)g] to an unknown metal salt solution has been used as a quaUtative test for those transition metals. 

Commercial-grade nitroparaftins are shipped and stored ia ordinary carbon steel. However, wet nitroparaftins containing more than 0.1—0.2% water may become discolored when stored ia steel for long periods, even though corrosion is not excessive. Aluminum and stainless steel are completely resistant to corrosion by wet nitroparaftins. Storage ia contact with lead (qv), copper, or alloys containing these metals should be avoided. Polymeric materials for gaskets, hoses, and connections should be tested for thek suitabiHty before exposure to nitroparaftins. 

For contact testing a couplant normally is used between the probe and the test piece. This material may be oil, water, or some gel or other Hquid or paste. Compatibihty with the test object is important, so that no unexpected chemical attack occurs, causing a crack to initiate. Whereas the frequency range for ultrasonic tests may extend from approximately 50 kH2 to 50 MH2, the range most commonly used for metallic test materials is 0.5—25 MH2. 

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