Complexometric Titration of Thallium(III) using Hydrazine Sulphate as Demasking Agent

82-8

Genetic analysis of yield, protein, oil and other related traits in soybean

Combining ability analysis was carried out for yield, protein and oil content and other traits related to productivity in a half diallel set involving seven parents. The estimates of sca variances were higher than gca variances for all the seven characters. Values of the ratio indicated that for traits like protein content, grain yield and days to maturity, non-additive gene effects were predominant. The mean values of parents reflected their combining ability effects in general and genotypes KHSb-2 and DS 74–62 were good general combiners for yield and yield contributing characters. The high performing crosses for yield involved parents with High x Low and Low x Low gca effects. Based on the results, suitable breeding strategies are suggested

Studies on Harvest Index in Soybean

According to Vogel et 01. (1963) the r.i.ght approach to increase the seed yield is the improvement in total biological yield and/or harvest index. Further, harvest index is a highly conservative and stable character (Spaeth et 01; 1984, Mercellos, 1987) and accounts for 95% variation in seed yield alongwith growth rate (Takeda et 01., 1979). These factors empha"ize the importance of harvest index in identifying the most efficient genotypes with superior biological and seed yielding abilities (Sharma et af., 1987). But the study of genetic architecture of harvest index is essential before embarking upon selection based 011 it. In the present study heterosis, combining abil ity and gene effects for harvest index were investigated..........

Complexes of Cu(I), Ag(I), TI(I), Zn(II) & Cd(II) with 3-Methyl & 3-Ethyl Derivatives of 4-Amino-5-mercapto-1,2,4-triazole

703-70

A study of the behaviour of certain known estimators on the non-extinction path of a branching process

Consider a super-critical Galton--Watson branching process. Gadag and Kunte (1980) have shown that such a process when restricted to non-extinction set does not retain branching property. In this note, we study the properties of the known estimators of the offspring mean (Nagaev, 1967) and offspring probability distribution and offspring probability generating function (Pakes, 1975), in the light of the result of Gadag and Kunte (1980).

Indirect complexometric determination of thallium(III) using thioglycolic acid as masking agent

227-229A simple and selective complexometric method for the determination of thallium(III) is proposed by using thioglycolic acid as a masking agent. In the presence of diverse metal ions thallium(III) is complexed with excess EDTA and the surplus EDTA is back titrated (pH5-6, hexamine) with standard zinc sulphate solution using xylenol orange indicator. A freshly prepared 1% aqueous solution of thioglycolic acid is then added to displace EDTA from TI (III)-EDTA complex and the released EDTA is titrated with standard zinc sulphate solution. The results for the determination of 4-87 mg of thallium are obtained with a relative error of 0.3% and coefficient of variation 0.46%. The effect of diverse ions are studied. The method is applied to the determination of thallium in its complexes and synthetic mixtures

Complexometric determination of palladium(II) using 2-mercapto propionyl glycine as demasking agent

127-129A simple, rapid and accurate complexometric method for the determination of palladium(II) is proposed, based on the selective demasking property of 2-mercapto propionyl glycine (MPGH2) towards palladium(II). In the presence of diverse metal ions, palladium(II) is complexed with excess of EDTA and the surplus EDTA is back titrated at pH 5-5.5 (acetic acidacetate buffer) with standard zinc sulphate solution using xylenol orange as indicator. An excess of a 0.2% aqueous solution of MPGH2 is then added to displace EDTA from Pd(II)-EDTA complex. The released EDTA is titrated with the same standard zinc sulphate solution as before. Reproducible and accurate results are obtained in the concentration range 2-22 mg of palladium with relative error of ±0.36% and coefficient of variation (n=6) not exceeding 0.31 %. The effect of diverse ions are studied. The method is used for the determination of palladium in its complexes, catalysts and synthetic alloy mixtures

Rapid spectrophotometric determination of platinum (IV) using piperonal thiosemicarbazone

988-990A simple, Rapid, selective and sensitive spectrophotometric method for the determination of platinum has been proposed based on the colour reaction between platinum(IV) and piperonal thiosemicarbazone (PATS) in 0.008 - 0. 032 M sulphuric acid medium. The greenish yellow complex has an absorption maximum at 360 nm. Beer's law is obeyed upto 6.5 ppm of Pt and the optimum concentration range is 1- 5.1 ppm of Pt. The molar absorptivity and Sandell's sensitivity are 3.239 × 104 l mol-1 cm-1 and 0.006 μg cm-2, respectively. The optimum conditions for complete colour development have been investigated by studying parameters like effect of medium, acidity, reagent concentration, time period and effect of diverse ions. The method is used for the, determination of platinum in hydrogenation catalysts and platinum complexes