scholarly journals Development of passive sampler POCIS for the analysis of polar pesticides in surface water

2015 ◽  
Vol 18 (2) ◽  
pp. 132-144
Author(s):  
Trang Thi Nhu Tran ◽  
Ty Thi Pham ◽  
Hai Lam Son Truong
Keyword(s):  
Surface Water ◽  
Environmental Factors ◽  
Pesticide Residues ◽  
Passive Sampling ◽  
Sampling Method ◽  
Passive Sampler ◽  
Polar Pesticides ◽  
Sampling Process ◽  
European Standards ◽  
First Time

The first time in Vietnam a passive sampling method has been developed to analyse the polar pesticides in surface water. The initial investigations of POCIS were performed for 7 polar pesticides as simazine,thiodicarb, carbofuran, chlortoluron, atrazine, isoproturon, and diuron. We determined the sampling rates RS for these substances ranged from 0.369 to 0.962 L day- 1. The obtained values of ku and RS showed the important influence of environmental factors such as flow on the ability to integrate polar pesticides in passive sampling process. This method can be applied to determine these 7 polar pesticides in surface water at trace levels according to European standards for pesticide residues in water (< 0.1 μg L-1).

scholarly journals Prevalence of pesticides in Krško-Brežice polje aquifer

Geologija ◽  
2021 ◽  
Vol 64 (2) ◽  
pp. 267-288
Author(s):  
Nina MALI ◽  
Anja KOROŠA ◽  
Janko URBANC
Keyword(s):  
Surface Water ◽  
Passive Sampling ◽  
Sampling Method ◽  
Agricultural Land ◽  
Plant Protection ◽  
Degradation Products ◽  
Plant Protection Products ◽  
The Past ◽  
Groundwater Samples ◽  
The World

Groundwater pollution with pesticides is a problem that occurs all over the world as well as in Slovenia. Considering the past high loads of groundwater with pesticides, the purpose of the presented research was to determine the presence of pesticides in the groundwater of Krško-Brežiško polje in the period 2018-2019 and to check the applicability of the passive sampling method. A total of 21 groundwater samples were taken at 11 locations and 2 samples each in the Sava and Krka rivers. We identified 15 pesticides and their degradation products. Atrazine and its degradation product desethylatrazine were most frequently determined in groundwater samples. They are followed by desethylterbutylazine, terbutylazine, metolachlor and simazine. Atrazine, desethylatrazine, chlortoluron, metolachlor and terbuthylazine were detected in surface water. A total of 24 samples were taken in groundwater and surface water using the qualitative passive sampling method. We singled out 8 pesticides that appear in two campaigns. The frequency and occurrence of individual pesticides by both methods are comparable. Passive sampling has proven to be an appropriate method of identifying the presence of pesticides. The highest loads in the Krško-Brežiško field arise from the agricultural land areas. Groundwater is more contaminated with pesticides in the central part of the field in the direction of groundwater flow from west to east. In the groundwater of the Krško-Brežice field, atrazine and desethylatrazine are still the most frequently detected pesticides with higher concentrations, despite a 20 years long ban on the use of atrazine-based plant protection products.

Calibration of the Chemcatcher® passive sampler for monitoring selected polar and semi-polar pesticides in surface water

2008 ◽  
Vol 155 (1) ◽  
pp. 52-60 ◽  
Author(s):  
Roman Gunold ◽  
Ralf Bernhard Schäfer ◽  
Albrecht Paschke ◽  
Gerrit Schüürmann ◽  
Matthias Liess
Keyword(s):  
Surface Water ◽  
Passive Sampler ◽  
Polar Pesticides

scholarly journals PERILAKU KONSUMEN DALAM KEPUTUSAN PEMBELIAN MARTABAK ITANG DI PAKOWA MANADO

2018 ◽  
Vol 14 (2) ◽  
pp. 45
Author(s):  
Peggy Nurhayati Suleman ◽  
Leonardus R. Rengkung ◽  
Juliana R. Mandei
Keyword(s):  
Consumer Behavior ◽  
Environmental Factors ◽  
Marketing Strategy ◽  
Sampling Method ◽  
Secondary Data ◽  
Primary Data ◽  
Individual Factors ◽  
Product Price ◽  
Sampling Process ◽  
Source Of Information

This study aimed to determine the consumer behavior based on individual, environmental, and marketing strategy factors in the buying decision of Martabak Itang in Pakowa, Manado. This study was expected to be the source of information to entrepreneurs about the consumers behavior in buying Martabak Itang in Pakowa, Manado, so that companies can determine and improve the strategy in dealing with the competition.The data used in this study were primary data and secondary data. The sampling method in this study was Accidental Sampling, which was taking the sample that accidentally met with the researcher. The total of sample taken in this study was 60 people. The sampling process was conducted in 6 days, which was the number of samples taken was 10 buyers for day for a week, from Monday until Saturday. The result of this study showed that individual factors measured by need and motivation did not affect the buying decision. Environmental factors measured by family and friends influencethe buying decision. While marketing strategy factors measured by product, price, promotion, location, and service influencethe buying decision.*lrr*.

Pengaruh Citra Merek, Kualitas Produk Dan Harga Terhadap Kepuasan Konsumen Pada Bisnis Franchise Minuman

2017 ◽  
Vol 24 (2) ◽  
pp. 144-153
Author(s):  
Yunita Fitri Wahyuningtyas
Keyword(s):  
Regression Analysis ◽  
Marketing Strategy ◽  
Product Quality ◽  
Multiple Regression Analysis ◽  
Multiple Regression ◽  
Sampling Method ◽  
Sampling Technique ◽  
Sampling Process ◽  
And Function ◽  
Simultaneous Influence

This research is conducted upon the emergence of many companies producing the same product of the same kind and function. It leads to the urgency of proper and well planned marketing strategy. This research aims to investigate how far the influence of branding, product quality, and price toward consumer’s satisfaction in beverage franchise business. This research utilizes 5 likert scale questionnaire which is tested by using multiple regression analysis to reveal whether or not there is partial and simultaneous influence of branding, product quality, and price toward consumer’s satisfaction in beverage franchise business. Sampling method is accidental sampling technique, in which sample of particular population is taken based on the accessibility and availability of the sample during the sampling process. Sample used is 100 samples among consumers or customers of Mang Endy Milkshake. The result shows that branding, product quality, and price influence consumer’s satisfaction in beverage franchise business.

Pesticide residues in groundwater and surface water: recent advances in GC-MS-SPME/SPE methods for multiclass analysis

2021 ◽  
pp. 106359
Author(s):  
Jonas da Silva Sousa ◽  
Hélio Oliveira do Nascimento ◽  
Hiago de Oliveira Gomes ◽  
Ronaldo Ferreira do Nascimento
Keyword(s):  
Surface Water ◽  
Pesticide Residues ◽  
Recent Advances

scholarly journals Calcification intensity in planktonic Foraminifera reflects ambient conditions irrespective of environmental stress

2013 ◽  
Vol 10 (10) ◽  
pp. 6639-6655 ◽  
Author(s):  
M. F. G. Weinkauf ◽  
T. Moller ◽  
M. C. Koch ◽  
M. Kučera
Keyword(s):  
Surface Water ◽  
Environmental Factors ◽  
Physiological Stress ◽  
Planktonic Foraminifera ◽  
Ambient Conditions ◽  
Shell Weight ◽  
Ambient Seawater ◽  
Ecological Stress ◽  
Water Composition ◽  
Oceanic Carbon

Abstract. Planktonic Foraminifera are important marine calcifiers, and the ongoing change in the oceanic carbon system makes it essential to understand the influence of environmental factors on the biomineralization of their shells. The amount of calcite deposited by planktonic Foraminifera during calcification has been hypothesized to reflect a range of environmental factors. However, it has never been assessed whether their calcification only passively responds to the conditions of the ambient seawater or whether it reflects changes in resource allocation due to physiological stress. To disentangle these two end-member scenarios, an experiment is required where the two processes are separated. A natural analogue to such an experiment occurred during the deposition of the Mediterranean sapropels, where large changes in surface water composition and stratification at the onset of the sapropel deposition were decoupled from local extinctions of planktonic Foraminifera species. We took advantage of this natural experiment and investigated the reaction of calcification intensity, expressed as mean area density (MAD), of four species of planktonic Foraminifera to changing conditions during the onset of Sapropel S5 (126–121 ka) in a sediment core from the Levantine Basin. We observed a significant relationship between MAD and surface water properties, as reflected by stable isotopes in the calcite of Foraminifera shells, but we failed to observe any reaction of calcification intensity on ecological stress during times of decreasing abundance culminating in local extinction. The reaction of calcification intensity to surface water perturbation at the onset of the sapropel was observed only in surface-dwelling species, but all species calcified more strongly prior to the sapropel deposition and less strongly within the sapropel than at similar conditions during the present-day. These results indicate that the high-salinity environment of the glacial Mediterranean Sea prior to sapropel deposition induced a~more intense calcification, whereas the freshwater injection to the surface waters associated with sapropel deposition inhibited calcification. The results are robust to changes in carbonate preservation and collectively imply that changes in normalized shell weight in planktonic Foraminifera should reflect mainly abiotic forcing.

scholarly journals Investigation of pesticide residues in surface water in some areas of agricultural production at Ho Chi Minh city

2013 ◽  
Vol 16 (3) ◽  
pp. 106-119
Author(s):  
Phu Ly Sy Nguyen ◽  
Nguyen Duc Do ◽  
Hien Thi To
Keyword(s):  
Surface Water ◽  
Pesticide Residues ◽  
Agricultural Production ◽  
Chromatographic Method ◽  
Organophosphorus Pesticides ◽  
Ho Chi Minh City ◽  
Growth Stages ◽  
High Concentrations ◽  
Gas Chromatographic Method ◽  
Agricultural Areas

Residual levels of organochlorine and organophosphorus pesticides in surface water in some agricultural areas at Ho Chi Minh City were investigated in 2012. Four organophosphorus pesticides including Malathion, Parathion, Ethion and Trithion and seven organochlorine pesticides including Alpha - HCH, beta-HCH, gammaHCH, aldrin, Heptachlor – epoxide, AlphaEndosulfan and Endosulfan-sulfate were determined in the surface water in four dicstricts : Binh Chanh, Hoc Mon, Cu Chi and Binh Tan using gas chromatographic method with electron capture detector (GCECD). The results showed that residues of pesticide were found with high concentrations in surface water in agricultural areas and pesticide residues changed depending on growth stages of crops. The concentration and distribution of pesticides were different in the water samples at different sites. Residues of pesticides such as Parathion, Ethion and Trithion were detected in surface water although these chemicals had been banned.

scholarly journals Komposisi Jenis Udang Air Tawar di Sungai Batambean, Pulau Labobo, Banggai Laut, Sulawesi Tengah, Indonesia

2019 ◽  
Vol 8 (2) ◽  
Author(s):  
Puji Rahayu ◽  
Annawaty Annawaty
Keyword(s):  
Environmental Factors ◽  
Species Composition ◽  
Sampling Method ◽  
Conservation Status ◽  
Freshwater Shrimp ◽  
Purposive Sampling ◽  
Freshwater Shrimps ◽  
The Family ◽  
Central Sulawesi ◽  
Abiotic Environmental Factors

Labobo isle is one of the satellite isle located around the mainland of Sulawesi Island. This study aims to determine the species composition of freshwater shrimp in the Batambean Stream located on Labobo Island, Banggai Laut, Central Sulawesi, Indonesia. A purposive sampling method based on the habitat of freshwater shrimps was applied to collect the shrimps. Measurement of abiotic environmental factors is carried out before samples collection. Furthermore, freshwater shrimp are collected using tray net and hand net. Collected specimens were preserved in alcohol 96%. The specimen wasidentified at the Laboratory of Animal Biosystematics and Evolution, Department of Biology, Faculty of Sciences, Tadulako University. The composition of freshwater shrimp species in the Batambean Stream consists of four species, namely Macrobrachium equidens, M. australe, and M. latidactylus and Caridina gracilipes. The first three species belong to the family Palaemonidae while the latter species is a member of the family Atyidae. The brief description and conservation status of each species  were also provided

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