scholarly journals Quantitative assessment of ionic status of pond water for irrigation and aquaculture usage in the selected sites of Mymensingh areas, Bangladesh

2019 ◽  
Vol 6 (2) ◽  
pp. 301-313
Author(s):  
Taslima Akter ◽  
Shampa Rani Ghosh ◽  
Sitesh Chandra Sarker ◽  
Md Mokhlesur Rahman ◽  
KM Eadun Nabi
Keyword(s):  
Water Samples ◽  
Quantitative Assessment ◽  
Ph Value ◽  
Pond Water ◽  
The Other ◽  
Acceptable Limit ◽  
Legal Limit ◽  
Other Hand ◽  
Agricultural Chemistry ◽  
Inorganic Components

Ponds are considered to be self-contained, land lock ecosystem which is often teeming with rich vegetation and diverse organismal life. The pond water contains different organic and inorganic components. The experiment was carried out in laboratory, Department of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh through collection of pond water from Gouripur and Muktagacha under Mymensingh division for assessment of major ionic status and suitability parameters for irrigation and aquaculture usage in quantitative way. Around 30 samples were collected from different location. On the basis of HCO3 ion, all water samples except 3 samples were not suitable for irrigation because this anion exceeded the acceptable limit (1.5 meL-1). On the other hand, HCO3 ion was not treated as problematic in all samples except 2 samples for aquaculture usages. The concentrations of Ca, Mg, Na, K, PO4 and SO4 were far below the recommended limit. Considering aquaculture usage, Cl ion was considered as hazardous in all the pond water samples because this anion was above the legal limit (<0.003mgL-1). pH value of pond ranged from 7.02 to 7.87 indicating alkaline in nature and were not problematic for irrigation and aquaculture usage. Among the major ionic constituents, the remarkable significant correlations existed between Ca vs Mg, Ca vs K, Mg vs SO4, K vs Na, Na vs SO4. Res. Agric., Livest. Fish.6(2): 301-313, August 2019

scholarly journals Investigation of Chemical Parameters and Major Anions of Two Selected Aquaculture Ponds at Santosh Region, Tangail, Bangladesh

2015 ◽  
Vol 7 (2) ◽  
pp. 89-92 ◽  
Author(s):  
F Hossain ◽  
R Afrin ◽  
MY Mia ◽  
MA Akbor ◽  
MA Ahsan
Keyword(s):  
Natural Resources ◽  
Water Sample ◽  
Water Samples ◽  
The Other ◽  
Chemical Parameters ◽  
Other Hand ◽  
Aquaculture Ponds ◽  
Major Anions ◽  
Value Of Water

The study was conducted to analyze the chemical parameters and major anionic contents of water from Taltola and Mullahbari Pond at Santosh, Tangail during the months from January to March 2014. Chemical parameters such as pH, EC, DO, TDS, BOD and Alkalinity of all water samples were ranged from 7.56 to 7.78, 239.7 to 342 ?S/cm, 4.3 to 5.7 mg/L, 123.7 to 175 mg/L, 2.1 to 2.63 mg/L and 87 to 154 ppm, respectively. On the other hand, the anions such as F-, Cl-, NO2-, NO3-, SO4-- were ranged from 0.221 to 3.8, 16 to 24, 2.5 to 3.8, 0.96 to 1.67 and 1.99 to 17.93 mg/L, respectively. In case of Br- the anionic value of water sample was not detectable.DOI: http://dx.doi.org/10.3329/jesnr.v7i2.22213 J. Environ. Sci. & Natural Resources, 7(2): 89-92 2014

scholarly journals Arsenic contamination in surface and groundwater in major parts of Manikganj district, Bangladesh

2016 ◽  
Vol 13 (1) ◽  
pp. 47-54 ◽  
Author(s):  
Atia Akter ◽  
MY Mia ◽  
HM Zakir
Keyword(s):  
Water Samples ◽  
Arsenic Contamination ◽  
The Other ◽  
Geochemical Processes ◽  
Other Hand ◽  
Groundwater Samples ◽  
Standard Value ◽  
Positive Correlations ◽  
Surface And Groundwater

The contamination of groundwater by arsenic (As) in Bangladesh is the largest poisoning of population in history, with millions of people exposed. Thirty (30) water samples were collected from 5 different Upazilas of Manikganj district in Bangladesh to determine the concentration of As as well as to assess the level of contamination. Concentrations of As in waters were within the range of 0.27 to 1.96; 0.43 to 5.09; trace to 6.69 mg L-1 at Singair, Harirampur and Ghior Upazila, respectively. But the concentration of As in waters both of Manikganj sadar and Shivalaya Upazila were trace. All surface and groundwater samples of Singair and Harirampur, and 4 groundwater samples of Ghior Upazila’s exceeded Bangladesh standard value for As concentration (0.05 mgL-1). The highest As concentration (6.69 mgL-1) was found in groundwater of Baliakhora village of Ghior upazila in Manikganj district. The cation chemistry indicated that among 30 water samples, 15 showed dominance sequence as Mg2+ > Ca2+ > Na+ > K+ and 14 samples as Ca2+ > Mg2+ > Na+ > K+. On the other hand, the dominant anion in water samples was Cl- followed by HCO3- and SO42-. Highly significant positive correlations were found in between the concentrations of As and SO42-(r=712**),and As and Ca2+ (r=581*), suggesting similar sources and/or similar geochemical processes controlling the occurrence of these ions in waters.J. Bangladesh Agril. Univ. 13(1): 47-54, June 2015

scholarly journals Change of Colour and pH-value in Pheasant Meat after Exposure to Ionizing Radiation

2007 ◽  
Vol 76 (8) ◽  
pp. S67-S71 ◽  
Author(s):  
P. Dvořák ◽  
J. Kunová ◽  
M. Vodňanský
Keyword(s):  
Ionizing Radiation ◽  
Ph Value ◽  
Negative Impact ◽  
The Other ◽  
Phasianus Colchicus ◽  
Post Mortem ◽  
Other Hand ◽  
The Impact

The purpose of this paper was to study the impact of ionizing radiation on the changes of colour and the pH-value of pectoral and femoral musculature in pheasants (Phasianus colchicus). The parameters of colour L*, a* and b* were observed before irradiation (24 hours post mortem) and after irradiation (60Co source, doses of 2.5 and 5 kGy). Reduction of the L* parameter, i.e. darkening, for all exposed samples was not significant. On the other hand, a significantly higher b* parameters for both exposed groups shown rather remarkably yellow colouring of pectoral musculature. Due to irradiation with a dose of 5 kGy a significant reduction (α = 0.05) of the average a* parameter from 8.99 to 7.10 was observed. However, the above-mentioned changes would not have any negative impact on the consumer.

scholarly journals Studies on the formation of carthamin in buffer solutions containing precarthamin and oxidizing agents

2014 ◽  
Vol 54 (3) ◽  
pp. 231-240 ◽  
Author(s):  
Koshi Saito ◽  
Yoshiyuki Takahashi
Keyword(s):  
Ascorbic Acid ◽  
Ph Value ◽  
The Other ◽  
Oxidative Conversion ◽  
Citrate Buffer ◽  
Low Concentration ◽  
Oxidizing Agents ◽  
Buffer Solutions ◽  
Other Hand ◽  
Optimal Ph

Formation of carthamin was investigated in bufferized solution containing precarthamin and oxidizing agents. KMnO<sub>4</sub>, H<sub>2</sub>O<sub>2</sub> and HIO<sub>4</sub>, were stimulators for carthamin formation. K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> Mn0<sub>2</sub>, Ag<sub>2</sub>O, SeO<sub>2</sub>, and CrO<sub>3</sub> on the other hand, showed little or no activity in the catalytic carthamin synthesis. KMnO<sub>4</sub> was very sensitive to precarthamin, while both H<sub>2</sub>O<sub>2</sub> and HIO<sub>4</sub> were insensitive. The optimal pH value for carthamin formation by KMnO<sub>4</sub>, was 5.3 in 50.0 mM citrate buffer. Antioxidants such as hydroquinone, L-ascorbic acid and D-araboascorbic acid completely inhibited the oxidative conversion of precarthamin to carthamin at a low concentration.

scholarly journals The effects of the flood of October 2008 on the water quality in the M’zab valley, Algeria

2019 ◽  
Vol 40 (1) ◽  
pp. 173-180
Author(s):  
Kheira Bouamer ◽  
Boualem Remini ◽  
Mohamed Habi ◽  
Khaled Rezzag
Keyword(s):  
Water Quality ◽  
Calcium Chloride ◽  
Magnesium Sulphate ◽  
Water Samples ◽  
Alluvial Aquifer ◽  
The Other ◽  
Spectroscopic Methods ◽  
Other Hand ◽  
Volumetric Methods

Abstract With a flow estimated at 1200 m3∙s−1 and a height of 8 m downstream, the flood that occurred on October 10, 2008 spread along the M’zab River over a length of more than 180 km. Material and human damage is visible, but its effects on the quality of the waters of the alluvial layer remain unknown: this is the purpose of this paper. Samples of groundwater were taken during the period 2005–2012 in 4 oases of the valley. Physicochemical analyses were performed using molecular and flame spectroscopic methods and also volumetric methods on water samples. The results obtained were interpreted using histograms and hydrochemical diagrams, such as the Avignon software (L.H.A) (version 4, 2008). Low effect of flood on the water quality of the alluvial aquifer was manifested by concentrations of magnesium sulphate and calcium chloride. On the other hand, there is an accumulation of salts infiltrated by sewage except for the zone of Bouchen. The diagrams show that there is an improvement in water quality in this area.

scholarly journals Physicochemical and Bacteriological Quality of Water from Storage Tanks in a Tertiary Institution in Rivers State, Nigeria

2021 ◽  
pp. 6-17
Author(s):  
N. P. Akani ◽  
T. Sampson ◽  
G. C. Disegha ◽  
V. Vincent-Okwuosa
Keyword(s):  
Water Samples ◽  
Water Sources ◽  
The Other ◽  
Storage Tanks ◽  
Tertiary Institution ◽  
Bacteriological Quality ◽  
Other Hand ◽  
Quality Of Water ◽  
Rivers State

Water quality analysis is essential in assessing the suitability of different water sources used for various purposes, including industrial and domestic uses. This study was therefore aimed at determining the physicochemical and bacteriological quality of water samples from different storage facilities in a tertiary institution in Port Harcourt, Rivers State, Nigeria. The study involved eighty (80) water samples obtained from water storage tanks situated at 16 locations within the premises of the institution, to ascertain the physicochemical property, presence and population of different bacterial groups influencing the quality of these water sources. In-situ and ex-situ physicochemical analyses as well as bacteriological investigations were carried out on all samples, using standard laboratory procedures. Results of physicochemical analysis showed that the pH ranged from 4.15±0.14 to 7.16±0.08; conductivity, from 50.55±0.49 (µs/cm) to 364.00±2.83; salinity, from 0.02±0 (ppt) to 0.18±0; temperature, from 27oC to 28oC; Chloride, from 1.03±0.06 (mg/l) to 10.80±0.79; total alkalinity, from 4.00±0 (mg/l) to 11.00±1.41; Dissolved oxygen from 3.04±.020 to 7.36±0.08 (Mg/l) and BOD ranged from 0.81±0 to 4.23±0.09 (Mg/l). Results for bacterial population showed total heterotrophic bacteria ranging from 1.03±1.19 x 103   CFU/ml in water from reservoir tanks at the Faculty of Engineering, to 5.89±2.59 x 103   CFU/ml at Road A Block B; total coliform count ranged from 0 CFU/ml in most samples, to 10.00±2.36 x 102 CFU/ml in Block B reservoir tanks. Water reservoirs in clinic area recorded the highest Salmonella/Shigella counts (1.00±0.23 x 101   CFU/ml) with other stations having zero counts. Hall F (Hostel Ext) on the other hand had the highest counts for Vibrio (2.20±3.01 x 101 CFU/ml). The phenotypic characterization identified Citrobacter spp. as the most occurring (27.27%) bacterial isolate in the study, followed by Alcaligenes faecalis and Klebsiella spp. (18.18% each). Enterobacter spp., Edwardsiella spp., Erwinia psidii, Acinetobacter spp., Pseudomonas spp., Providentia spp. and Salmonella spp. all appeared as the least occurring, having a percentage of 4.55%, each. Tatumella spp. on the other hand had a percentage occurrence of 9.09%. This study has buttressed the need for increased water hygiene of reservoir tanks as well as water sources in these locations.

A study of cometary eruptions through OH radio-lines

1999 ◽  
Vol 173 ◽  
pp. 249-254
Author(s):  
A.M. Silva ◽  
R.D. Miró
Keyword(s):  
Short Duration ◽  
Growth Curves ◽  
The Other ◽  
Initial Mass ◽  
Radio Lines ◽  
Other Hand ◽  
Sudden Rise

AbstractWe have developed a model for theH2OandOHevolution in a comet outburst, assuming that together with the gas, a distribution of icy grains is ejected. With an initial mass of icy grains of 108kg released, theH2OandOHproductions are increased up to a factor two, and the growth curves change drastically in the first two days. The model is applied to eruptions detected in theOHradio monitorings and fits well with the slow variations in the flux. On the other hand, several events of short duration appear, consisting of a sudden rise ofOHflux, followed by a sudden decay on the second day. These apparent short bursts are frequently found as precursors of a more durable eruption. We suggest that both of them are part of a unique eruption, and that the sudden decay is due to collisions that de-excite theOHmaser, when it reaches the Cometopause region located at 1.35 × 105kmfrom the nucleus.

Closing the GAP—A 5Å Scanning Microscope

1969 ◽  
Vol 27 ◽  
pp. 6-7
Author(s):  
A. V. Crewe
Keyword(s):  
Normal Form ◽  
The Other ◽  
Resolving Power ◽  
Scanning Microscope ◽  
Conventional Microscope ◽  
Other Hand ◽  
Closing The Gap ◽  
Thermal Sources ◽  
Better Than ◽  
Transmission Microscope

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.

Life Beyond 1MeV

1980 ◽  
Vol 38 ◽  
pp. 30-33
Author(s):  
K.H. Westmacott
Keyword(s):  
Electron Microscopy ◽  
Past Experience ◽  
The Other ◽  
Good Case ◽  
Other Hand ◽  
The U.S

Life beyond 1MeV – like life after 40 – is not too different unless one takes advantage of past experience and is receptive to new opportunities. At first glance, the returns on performing electron microscopy at voltages greater than 1MeV diminish rather rapidly as the curves which describe the well-known advantages of HVEM often tend towards saturation. However, in a country with a significant HVEM capability, a good case can be made for investing in instruments with a range of maximum accelerating voltages. In this regard, the 1.5MeV KRATOS HVEM being installed in Berkeley will complement the other 650KeV, 1MeV, and 1.2MeV instruments currently operating in the U.S. One other consideration suggests that 1.5MeV is an optimum voltage machine – Its additional advantages may be purchased for not much more than a 1MeV instrument. On the other hand, the 3MeV HVEM's which seem to be operated at 2MeV maximum, are much more expensive.

Can the Academic Self-Concept be Positive and Realistic?

2005 ◽  
Vol 19 (3) ◽  
pp. 129-132 ◽  
Author(s):  
Reimer Kornmann
Keyword(s):  
Academic Performance ◽  
Opposite Effect ◽  
Self Esteem ◽  
Point Of View ◽  
The Other ◽  
Self Concept ◽  
High Ability ◽  
Self Image ◽  
Other Hand

Summary: My comment is basically restricted to the situation in which less-able students find themselves and refers only to literature in German. From this point of view I am basically able to confirm Marsh's results. It must, however, be said that with less-able pupils the opposite effect can be found: Levels of self-esteem in these pupils are raised, at least temporarily, by separate instruction, academic performance however drops; combined instruction, on the other hand, leads to improved academic performance, while levels of self-esteem drop. Apparently, the positive self-image of less-able pupils who receive separate instruction does not bring about the potential enhancement of academic performance one might expect from high-ability pupils receiving separate instruction. To resolve the dilemma, it is proposed that individual progress in learning be accentuated, and that comparisons with others be dispensed with. This fosters a self-image that can in equal measure be realistic and optimistic.

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