Investigation of Azambur Mirabilite Deposit and Lake Water to Obtain Anhydrous Sodium Sulfate

Under the influence of environmental conditions, the article examines the change in the physical and chemical properties of the natural brine system containing sodium sulfate, which is located in Georgia, on the territory of the municipality of Sagarejo. To this purpose in November-June 2019-2020 the full chemical compositions of natural brine were studied at one-month intervals. The following ions were studied in brine: SO4 2-, Cl- , HCO3 - , CO3 2-, Na+ , K+ , Ca2+ and Mg2+.. In water samples, conductivity was also measured. The concentrations of the studied ions in the natural brine vary with the season, in particular, all the studied ions begin to decrease in the fall, sharply decrease in the winter, increase in the spring and significantly increase in the summer.

Chemical Composition and Larvicidal Activities of Essential Oils of Medicinal Plants, Artemisia Sieberi and Tanacetum Balsamita Against Malaria Vector, Anopheles Stephensi

Background: The country is suffering from malaria disease. There are several chemical control of mosquito. Due to resistant of vectors to different pesticides, this research was conducted to measure the chemical components and larvicidal activities of two native plants, Artemisia sieberi and Tanacetum balsamita against Anopheles stephensi.Materials and methods: Two species of medicinal plants were collected from different localities in in Iran. The plant samples were dried in shaded place and Essential Oils (EO) dried over anhydrous sodium sulfate. The EOs was maintained in the dark sealed vials until conduction larvicidal tests. The maximum storing of EOs was two days. The larvicidal tests were carried out based on the guideline of WHO. Results: The values of LC50 and LC90 of EOs were 47.9 and 178.8 ppm for Artemisia sieberi. The figure of 26.2and 52.4 ppm was observed for Tanacetum balsamita.The chemical constituents of Tanacetum balsamita and Artemisia sieberi which showed the highest efficacy for larviciding. A total of 39 constituents were isolated from Tanacetum balsamita .The main constituents were Thujone (52.37%) and Carvone (26.84%). Totally 57 constituents were detected in Artemisia sieberi and the main components were : camphor (23.6%) , 2-Ethyl-3- methyl maleic anhydride (15. 193%) and, Bombykal (10.32%) , Ethylbutenol (10.74%) .Conclusion: New formulations of plants should be prepared and then evaluated under semi-filed and filed conditions in a malrious areas.

Residual Content of Persistent Insecticides in the Fresh Nuts of Cola Acuminata Cohac from Kumbotso Local Government Area of Kano State and Implication for Public Health

The pesticide residues in kola nut, Cola acuminata obtained from Mariri Market, Kumbotso Local Government Area, Kano state of Nigeria was investigated. The study consisted of a survey and laboratory analysis of kola nut samples. One hundred structured questionnaires were administered through an open market format in the major kola nut market in the state. In addition, 1kg sample of kola nut was collected randomly from ten major kola nut sellers in the market for analysis. A 100g sample of the kola nut was pounded into paste in a blender of which 50g was soaked in 150mL acetone for 24h. The extracted sample was filtered through anhydrous sodium sulfate while the extract was evaporated to near dryness using a rotary evaporator at 28oC in the Laboratory. Residue was redissolved in 2 mL acetone and kept in the refrigerator for GCMS Analysis. Ten pesticidal compounds were detected from a comparison of data with reference to mass spectrometry data (NIST05.LIB) and significant occurrence in kola nut sample which had a corresponding molecules affiliated to some pesticides standards were detected in the sample

Influence of Drying in Hyptis pectinata Essential Oil

The present study assessed the effects of drying at different temperatures (35, 45 and 55 °C) and air velocities (1 and 2 m s-1) on the content and chemical characteristics of Hyptis pectinata essential oil. Drying was conducted in a fixed-bed dryer, and the temperatures and air velocities were controlled and recorded by an automated system. A 350±0.12 g quantity of fresh leaves was used for each of the four repetitions in each dryer. From the material obtained after drying, 60 g of each repetition was used to extract essential oil by the hydrodistillation method. Dichloromethane was used as the solvent, and anhydrous sodium sulfate was used as the desiccating agent. Gas chromatography in the forms of GC-MS and GC-FID were used for the chemical characterization of the essential oil compounds. Decreasing drying times and decreasing concentrations of essential oils were observed with increasing temperatures. A GC-MS analysis of the essential oil from H. pectinata leaves led to the identification of 19 compounds. A sesquiterpene called caryophyllene oxide was the most abundant compound under all drying conditions, with the highest concentration at a temperature of 55 °C, ranging from approximately 42 to 53%.

A first report of a new chemotype of Thymus migricus (Klokov & Desj-Shost) from East Azarbaijan province of Iran

In order to determine Thymus migricus volatile compounds, sampling from two regions of East Azerbaijan province located in Northwestern Iran was performed. After drying the samples at room temperature, the essential oils were taken by the hydrodistillation method for 2.5 hours. The essential oils were dehydrated over anhydrous sodium sulfate. Compositions of the oils were identified by GC and GC-MS analyses. The eleven and nine identified compounds from Mishoo and Espiran regions represent 94.62% and 86.08% total oil compositions, respectively. In Mishoo, the percentages of main compounds included linalool (65.57%), citronellol (15.63%) and geraniol (2.79%) and in Espiran, there were linalool (46.36%), geraniol (26.74%), and geranyl acetate (6.17%). The present chemotype of this species is reported for the first time in East Azarbaijan, Iran.

Study on Solid Surface Sizing Agent for Paper

The analysis of all kinds of selected chemicals, mixed starch was donethrough a specific process and orthogonal experiments. The best proportion ofthe new type of surface sizing agent was prepared through the glue applicationexperiments, testing paper physical properties. The results showed that thebest formula of surface sizing agent including borax, sodium silicate,anhydrous sodium sulfate, ferrous chloride which ratio is 3:4:2:1. At the sametime modifying agent was added so that the stable performance can be obtainedfrom the solid surface sizing agent. Homemade solid surface sizing agent canmake paper greatly improve the sizing degree, increased by 50.9%, the stiffnessof the tear strength increased by 56.7%, folding degrees increased by 53.0%.Compared with the surface sizing agent market, various aspects index improvedsignificantly.

Experimental Research on Si-Mn Slag Cementitious Material

A Si-Mn Slag Cementitious Material was prepared by mixing Si-Mn slag, circulating fluidization bed slag as raw material. The results shows that circulating fluidization bed slag and Si-Mn slag has a preferably additive effect in a certain range by combination of lime, anhydrite and anhydrous sodium sulfate as activator, and the strength of samples reach the peak at circulating fluidization bed slag of 8%, Si-Mn slag of 70%, anhydrous sodium sulfate of 2%, anhydrite of 10%, lime of 10%. The strength, setting time and soundness were also tested and the results can meet most of the requirements of OPC standard (42.5) GB/T 175-2007.

Orthogonal Experiment Design and Analysis of Compound Activator

According to the intuitive analysis and variance analysis of L16 (45) orthogonal experiment, the activity of slag was investigated on component of compound activator and mixing amount with the compressive strength as evaluation standard of various influencing factors. The results show that the range of anhydrous sodium sulfate (NS) was maximum, clinker (NL) comes second and lime (NH) was minimum, which means that primary and secondary of compound activator to the compressive strength of slag cementations material was NS>NL>NH, and the better activated effects can be obtained as NS=4%, NL=0.6% and NH=0.6%.

Development and Validation of an HPLC Method for Determination of Spirotetramat and Spirotetramat cis enol in Various Vegetables and Soil

An easy and simple analytical method was standardized and validated for the estimation of residues of spirotetramat and its metabolite spirotetramat cis enol in various substrates: okra fruits, brinjal leaves and fruits, green chili, red chili, and soil. The samples were extracted with acetonitrile, diluted with brine solution, partitioned into dichloromethane, dried over anhydrous sodium sulfate, and cleaned up by treatment with activated charcoal powder. Final clear extracts were concentrated under vacuum and reconstituted with HPLC grade acetonitrile. Residues were estimated using HPLC with a photodiode array detector and a C18 column, and confirmed by HPTLC. Acetonitrile was used as the mobile phase at 0.4 mL/min. Both spirotetramat and spirotetramat cis enol presented distinct peak at retention times of 8.518 and 7.598 min, respectively. Consistent recoveries ranging from 82 to 97% for spirotetramat and spirotetramat cis enol were observed when samples were spiked at 1.00 to 0.03 mg/kg levels. The LOQ of the method was found to be 0.03 mg/kg. The analytical method was validated in terms of parameters, including selectivity, linearity, precision, and accuracy.