Quantification of Cr (VI) by Spectrophotometric and Atomic AbsorptionTechnique in Industrial Effluent

Dr. Kishore Kumar Tiwari, Vandana Agrawal, Dr. S.K.Chaterjee,Dr.Deepak Sinha; JECET; March 2018- May 2018; Sec. A; Vol.7. No.2, 279-287.; [DOI: 10.24214/jecet.A.7.2.27987.]

Abstract

A simple sensitive and selective spectrophotometric method has been developed for the quantification of chromium. Given method is based on the reaction of chromium (VI) with acidified potassium iodide to liberate iodine. The liberated iodine selectively oxidises leuco malachite green to malachite green in the presence of sodium hydroxide. This dye shows maximum absorbance at 590nm. The system obey’s Beer’s law in the range of 0.4 to 2.0μg chromium (VI) perml.The molar absorptivity and Sandell’s sensitivity were found to be 2.04x104 l-1mol-1cm-1& 0.0051μg cm-2.Proposed method is successfully applied for the determination of chromium in industrial effluent samples and results are compared with AAS method.

Quantification of Cr (VI) by Spectrophotometric and Atomic AbsorptionTechnique in Industrial Effluent

Dr. Kishore Kumar Tiwari, Vandana Agrawal, Dr. S.K.Chaterjee,Dr.Deepak Sinha; JECET; March 2018- May 2018; Sec. A; Vol.7. No.2, 279-287.; [DOI: 10.24214/jecet.A.7.2.27987.]

Abstract

A simple sensitive and selective spectrophotometric method has been developed for the quantification of chromium. Given method is based on the reaction of chromium (VI) with acidified potassium iodide to liberate iodine. The liberated iodine selectively oxidises leuco malachite green to malachite green in the presence of sodium hydroxide. This dye shows maximum absorbance at 590nm. The system obey’s Beer’s law in the range of 0.4 to 2.0μg chromium (VI) perml.The molar absorptivity and Sandell’s sensitivity were found to be 2.04x104 l-1mol-1cm-1 & 0.0051μg cm-2.Proposed method is successfully applied for the determination of chromium in industrial effluent samples and results are compared with AAS method.

A Study of Spent Black Liquor from Kraft Pulping Process

Dr. Hemlata Raikwar, Dr. Anita chouwbay; JECET; March 2018- May 2018; Sec. A; Vol.7. No.2, 274-278.; [DOI: 10.24214/jecet.A.7.2.27478]

Abstract

Approximately 7.1 tonnes of black liquor are produced in the manufacture of one tonne of kraft pulp. The spent black liquor is an aqueous solution of lignin residue, hemicellulose and the other organic chemicals used in the process. The black liquor the comprises 15 % solid by weight of which 10.1 % are organic chemicals and 4.9% are inorganic chemicals. Hardly the organic in black liquor are 40-49.9 % soaps, 35-45.4 % lignin, sulphur content at 1-1.9 %, sodium content at about 6% and 10-14% other. The Kraft chemical recovery process is a mature effective technology that provides for recycling of the pulping chemicals, efficient generation of stem and electrical power from the fuel value of the black liquor and effective disposal of dissolved wood substances. Forest bio refinery is an alternative approach for the pulping industry and aim to produced value –added products from lignocellulose.

A Review on Role of Factors Affecting Pulp Yields in Kraft/Soda Pulping Process

Dr Hemlata Raikwar, Dr Anita Chouwbay; JECET; March 2018- May 2018; Sec. A; Vol.7. No.2, 266-273.; [DOI: 10.24214/jecet.A.7.2.26673]

Abstract

This review article highlights the role of factors which are playing important role in increasing pulp yields during kraft/soda pulping process to get more productions of good quality paper in paper manufacturing industry. Delignification is one of the most important factors for making paper in paper industry. In pulp production factors like that shorter cooking time, insensitivity to wood species, efficient energy and chemical recovery capabilities are also played important roles. Independent cooking variables viz. temperature, time, ethanol concentration, soda concentration and temperature of wash disintegrate were also influenced pulp yields of Leucaena diversifolia by means of ethanol/soda/water mixtures. The good percentage yield could be obtained with 1%NaOH soluble, hot water soluble, ethanol–benzene extractives, holo-cellulose lignin and a cellulose contents, viscosity, Kappa number of the pulps and tensile index of the paper sheets as the most suitable operating conditions. Poly-Oxo-Metalates (POMs) and Oxygen could be an effective alternative for ligno-cellulosic pulp delignification. Unbleached wheat straw-anthraquinone (AQ) pulp could be used as a blend with the old corrugated cardboard (OCC) pulp for making fluting paper. Finally, it can be concluded that soda Anthraquinone pulping process produced the best results in terms of pulp yield, viscosity and kappa number.

Diversity of freshwater planktons at Haro Dam, Ghatol, Banswara (Rajasthan)

Manish Kunwar Sisodiya, Lalit Choudhary, Pooja Joshi and Seema Bharadwaj; JECET; March 2018- May 2018; Sec. A; Vol.7. No.2, 260-265.; [DOI: 10.24214/jecet.A.7.2.26065.]

Abstract

Plankton diversity is one of the most important ecological parameters in water quality assessment. The distribution of planktons depends on a complex of factors such as, change of climatic condition, physical and chemical parameters and vegetation cover. The present study deals with the qualitative and quantitative study of Zooplanktons and Phytoplankton’s in “Haro Dam” of Ghatol Banswara (Rajasthan). In the present investigation an attempt has been made to analyze the percentage variation among all planktons collected and identified for the period of January 2017 December 2017.