Comparisons of the Absorption of Hydrogen by Palladium/Platinum, Palladium/Nickel and Palladium/Rhodium Series of Alloys
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Article Comparisons of the Absorption of Hydrogen by Palladium/Platinum, Palladium/Nickel and Palladium/Rhodium Series of Alloys was published on March 1, 1973 in the journal Zeitschrift für Physikalische Chemie (volume 84, issue 1-4).Bimetallic strip
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A method for continuous determination of palladium and rhodium by resin spectrophotometry with developer 5 Br PADAP is reported in this paper. It has higher sensitivity and good selectivity. The molar absorbancy indexes of palladium and rhodium are 3.307 0×10 5 L/(mol·cm) and 5.572 3×10 5 L/(mol·cm) respctively. Lambert Beer law is obeyed when palladium and rhodium are between 0.0～16.0 μg/25 mL and 0.0～10.0 μg/25 mL. Detection limits of palladium and rhodium are 1.61×10 -2 μg/25 mL and 9.23×10 -3 μg/25 mL respectively. Coexistent ions do not interfere with the determination of palladium and rhodium. The results of determining palladium and rhodium in water are satisfied.
Spectrophotometry
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E M.F -temperature reference tables are given for platinum, 10% rhodium-platinum and platinum, 13% rhodium-platinum thermocouples over the range from 0° to 1,760° C. The tables are based on the calibration of twelve thermocouples of each kind, six from each of two manufacturers. Each set of six thermocouples comprised two samples from each of three batches of wire The calibrations are in terms of the International Temperature Scale as revised at the Ninth General Conference of Weights and Measures held in Paris in October 1948 The methods of intercomparison between the thermocouples and the various interpolation instruments specified in the International Temperature Scale are described. It is shown that the difference between the new tables and the old are mainly due to changes in the International Temperature Scale, and that the new tables represent the shape of the E.M.F.-temperature characteristics of the thermocouples of either make sufficiently closely to give interpolation between calibration points with accuracy within ±1° C up to 1,063° C., ±2° C. up to 1,550° C., and ±3° C. above this temperature.
Thermocouple
Atmospheric temperature range
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Organometallic Chemistry
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A novel method for the simultaneous spectrophotometric determination of rhodium and palladium based on the colour reaction of rhodium and palladium with 5 (5 nitor 2 pyridylazo) 5 dimethylaminoamiline (5 NO 2 PADMA) was proposed. The results showed that rhodium reacted with 5 NO 2 PADMA in the pH range of 3.5～7 0 to form a red complex which could be further changed into another deep coloured stable species by addition of mineral acid. Palladium formed a blue complex with the reagent in a strong acidic medium. The apparent molar absorptivity of the rhodium and palladium complexes were 1 39×10 5 and 9 4×10 4 L·mol -1 ·cm -1 at 620 nm,respectively. Berr's law was obeyed in the range of 0～0.56 μg·mL -1 for Rh and 0～1.4 μg·mL -1 for Pd. Most common ions did not interfere. The method was applied to the determination of rhodium and palladium in ore and catalyst samples with satisfatory results.
Molar absorptivity
Spectrophotometry
Mineral acid
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Stripping (fiber)
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Atomic-Absorption Spectroscopic Determination of Noble Metals. 4. Influence of Palladium and Rhodium on the Determination of Platinum. There are a number of serious interferences in the determination of platinum by atomicabsorption spectrometry. The influences of palladium and rhodium have been investigated. It is shown that they can be eliminated by an addition of uranium and by quadratic correction equations. Addition of lanthanum is not suitable.
Lanthanum
Noble metal
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Gold,platinum and palladium were recovered from platinum-palladium concentrate by the process ofchloridizing leaching-reducing gold with sodium sulfite-precipitating platinum with ammonium chloride-precipitating palladium with ammonia.The results showed that purity of spongy platinum and spongy palladium are over 99.95%,total yield are over 98%.
Sodium sulfite
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Methods are described for the determination of palladium, rhodium, and ruthenium in matte solutions by means of x-ray fluorescence. The best results for palladium determinations were obtained using background measurements to calculate absorption effects. Palladium was used as a variable internal standard for the determination of rhodium and ruthenium. Coefficients of variation of the order of 1% were obtained throughout.
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Reference tables covering the temperature range 0–1880°C have been established for platinum-40% rhodium/platinum-20% rhodium thermocouples. They are based on calibrations in air of ten thermocouples from four wire lots. These calibrations included freezing point determinations of zinc, antimony, silver, and gold; melting point determinations of palladium and platinum by the wire method; comparisons with standard platinum-10% rhodium/platinum and platinum-20% rhodium/platinum-5% rhodium thermocouples from 0 to 1750°C; and intercomparisons of the test thermocouples from 0 to 1850°C. The accuracy and stability to be expected from this thermocouple combination is discussed. More detailed tables than those presented here are available as APH Report No. 1292.
Thermocouple
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