scholarly journals Transportation, preparation and storage of frozen soil samples for laboratory testing

1978 ◽  
Vol 15 (2) ◽  
pp. A26
Author(s):  
T.H.W. Baker
Keyword(s):  
Laboratory Testing ◽  
Soil Samples ◽  
Frozen Soil ◽  
And Storage

scholarly journals Variations in soil carbon, nitrogen, phosphorus and stoichiometry along forest succession in southern China

2017 ◽  
Author(s):  
Shuai Ouyang ◽  
Wenhua Xiang ◽  
Mengmeng Gou ◽  
Pifeng Lei ◽  
Liang Chen ◽  
...  
Keyword(s):  
Soil Carbon ◽  
Forest Succession ◽  
Southern China ◽  
Floristic Composition ◽  
Soil Samples ◽  
Variation Patterns ◽  
Soil Stoichiometry ◽  
And Storage ◽  
Composition Changes ◽  
Nitrogen Phosphorus

Abstract. Floristic composition changes during forest succession influence nutrient cycling. However, variation patterns of soil carbon (C), nitrogen (N), and phosphorous (P), and soil stoichiometry (C : N, C : P, and N : P ratios) along forest succession are controversial. In this study, soil samples were collected at depths of 0–10, 10–20, and 20–30 cm in three forests at early, middle, and late succession stages. Concentrations of soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) were measured. As succession proceeds, concentrations and storage of SOC and TN exhibited a significant increasing tendency, while those of TP decreased significantly. The tendency was more pronounced (P 

Ecological Chemistry Aspects of Food Safety

2020 ◽  
pp. 472-490
Author(s):  
Rodica Sturza
Keyword(s):  
Raw Materials ◽  
Polymeric Materials ◽  
Soil Samples ◽  
Anthropogenic Contamination ◽  
Transfer Factors ◽  
Ecological Chemistry ◽  
Republic Of Moldova ◽  
The Republic ◽  
And Storage ◽  
Technological Treatment

The presented results reflect the researches carried out over the last decade, having as their object the soil, water, vegetal raw materials, and wines from the Republic of Moldova. The analysis of the possible anthropogenic contamination (NAA method) demonstrated the absence of systematic soil pollution. A total of 30 elements were determined in soil samples and the soil-leaves-fruit transfer factors were calculated. Approximately 3000 samples of local wines have been analysed to determine the residual quantities of pesticides. POPs were not found in any of the wine samples. In most of the examined cases (> 60% of samples), the lack of organic pesticide residues was observed. The migration of phthalates into different solutions from polymeric materials (PVC, rubber) and the influence of the temperature on the extraction rate were investigated. It has been shown that the contamination with phthalate residues occurs predominantly at the stage of grape processing, technological treatment, and storage.

Influence of exogenous and endogenous factors on the quality of the preanalytical stage of laboratory tests (review of literature)

2020 ◽  
Vol 65 (12) ◽  
pp. 778-784
Author(s):  
D. P. Piskunov ◽  
L. A. Danilova ◽  
A. S. Pushkin ◽  
S. A. Rukavishnikova
Keyword(s):  
Laboratory Testing ◽  
Cell Metabolism ◽  
Endogenous Factors ◽  
Preanalytical Phase ◽  
Exogenous Factors ◽  
The Stability ◽  
The Right ◽  
Needle Diameter ◽  
And Storage

A literature review in the article presents an analysis of the influence of endogenous and exogenous factors on quality of preanalytical phase of laboratory testing. The review shows significance of external and internal factors influencing blood samples at preanalytical phase of laboratory testing. Among the exogenous factors considered: phlebotomy, test tubes for samples, transportation and storage. A number of factors exist at this phase that significantly affect test results. We examined these aspects of phlebotomy process: staff training, disinfectant contamination, needle diameter, needle material contamination. The review considers possible contamination with tube components and the importance of choosing the right anticoagulants and excipients. Transportation and storage of biological samples can be a source of errors at the preanalytical phase of laboratory testing. We analyzed the problem of determining the stability of analytes during storage and aspects of transportation samples by modern means. Among the endogenous factors considered: hemolysis, lipemia, icterricity, cell metabolism.. Hemolysis is one of the most frequent consequences of errors at the preanalytical phase. We analyzed importance of choosing a method for identifying hemolized tubes and the heterogeneity of bias results on different analytical systems. The review shows contribution of various classes of lipoproteins to turbidity of sample, possible preanalytical errors and impact on analytical tests. We examined possible effects of high bilirubin concentrations on analyte measurements. In the review, we also examined metabolism of some cells and its effect on samples.

Exchangeable cations and cation exchange capacity of forest soil samples: Effects of drying, storage, and horizon

1994 ◽  
Vol 74 (4) ◽  
pp. 421-429 ◽  
Author(s):  
Wietse L. Meyer ◽  
Paul A. Arp
Keyword(s):  
Organic Matter ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Storage Time ◽  
Ammonium Acetate ◽  
Exchange Capacity ◽  
Soil Samples ◽  
Storage Effects ◽  
And Storage ◽  
Extractable Al

Concentrations of Ca, Mg, K, Na, Al, Fe, Mn, and Si extractable with 1 N ammonium chloride (NH4Cl, pH 4.5) and 1 N ammonium acetate (NH4OAc, pH 4.5) were determined for forest soil samples as follows: (1) before drying, and (2) at several time intervals after air-drying (1, 5, 11 and 14 wk). Values for CEC were obtained for the same samples by determining (1) the sum of cations (Al3+, Ca2+, Mg2+, K+, Na+, Fe3+, and Mn2+) in the extracts [denoted [Formula: see text] and [Formula: see text]], and (2) the amount of ammonium retained by the soil samples against water washing [denoted CEC(NH4OAc) and CEC (NH4Cl)]. The soils used in this investigation were taken from four New Brunswick upland forest sites (two sugar maple sites, one mixed wood site, and one spruce site). It was round that (1) extractable Mg, K, Na, and Mn levels were generally not affected by drying, storing, and type of extradant; (2) extractable Al and Fe levels increased immediately after drying; (3) NH4OAc-extracted Al, Fe, and Si exceeded NH4Cl-extracted Al, Fe, and Si; (4) extracted Al and Fe levels tended to drop after 11 wk of storage; (5) small drying effects were also noticed for NH4Cl-extracted Ca; (6) CEC(NH4OAc) and CEC(NH4Cl) values decreased with increasing time of storage; this effect was noticed most for soil samples with high levels of organic matter (Ah, Ahe, Bm, Bf, and Bfh), and was noticed least for sod samples taken from leached horizons (Ae) and subsoil horizons (BC and C); (7) in some cases, storage time increased CEC(NH4OAc) in subsoils; (8) values for [Formula: see text] remained fairly independent or increased slightly with storage time and were closely related with CEC(NH4Cl) values obtained with non-dried samples; (9) values for [Formula: see text] did not relate well with CEC(NH4OAc) and CEC(NH4Cl). Differences for extractable Al were likely due to Al complexation by acetate ions. Drying effects on extractable Al and Fe (and possibly Ca) were likely due to drying-induced fragmentation of soil organic matter. Drying and storage effects on CEC(NH4OAc) and CEC(NH4Cl) were likely due to (1) water-washing and related loss of organic matter, and (2) sensitivity of subsoil minerals to air exposure. Apparent drying and storage effects on CEC were most noted with [Formula: see text] and were least noted with [Formula: see text]. Key words: Cation exchange capacity, ion exchange, drying, storage, ammonium acetate, ammonium chloride extractions

scholarly journals Industrial solid waste (whitewash mud) use in forest road pavements

2004 ◽  
Vol 28 (4) ◽  
pp. 547-551 ◽  
Author(s):  
Carlos Cardoso Machado ◽  
Reginaldo Sérgio Pereira ◽  
Dario Cardoso de Lima ◽  
Carla Ribeiro Machado e Portugal ◽  
José Maurício Machado Pires ◽  
...  
Keyword(s):  
Solid Waste ◽  
Laboratory Testing ◽  
Dry Weight ◽  
Soil Samples ◽  
Permeability Test ◽  
Testing Program ◽  
Forest Road ◽  
Industrial Solid Waste ◽  
Engineering Parameters ◽  
Transportation Research

The objective of the present study was to evaluate the effects of industrial solid waste (whitewash mud) on geotechnical properties considering the following engineering parameters: California Bearing Ratio (CBR), Atterberg limits and Permeability test. Seven soil samples derived from Alagoinhas, Bahia - Brazil, were classified by the Transportation Research Board (TRB) system. Two were selected as having a great geotecnical potential classified as A-3 (0) and A-2-4 (0), whitewash mud contents 10%, 15%, 20% and 25% dry weight and medium compaction effort were studied in the laboratory testing program. The results indicated the soil denominated good gravel as being the most promising one, when stabilized with whitewash mud, reaching the best results with the dosage of 20 and 25% of whitewash mud.

Ecological Chemistry Aspects of Food Safety

2021 ◽  
pp. 20-38
Author(s):  
Rodica Sturza
Keyword(s):  
Raw Materials ◽  
Polymeric Materials ◽  
Soil Samples ◽  
Anthropogenic Contamination ◽  
Transfer Factors ◽  
Ecological Chemistry ◽  
Republic Of Moldova ◽  
The Republic ◽  
And Storage ◽  
Technological Treatment

The presented results reflect the researches carried out over the last decade, having as their object the soil, water, vegetal raw materials, and wines from the Republic of Moldova. The analysis of the possible anthropogenic contamination (NAA method) demonstrated the absence of systematic soil pollution. A total of 30 elements were determined in soil samples and the soil-leaves-fruit transfer factors were calculated. Approximately 3000 samples of local wines have been analysed to determine the residual quantities of pesticides. POPs were not found in any of the wine samples. In most of the examined cases (> 60% of samples), the lack of organic pesticide residues was observed. The migration of phthalates into different solutions from polymeric materials (PVC, rubber) and the influence of the temperature on the extraction rate were investigated. It has been shown that the contamination with phthalate residues occurs predominantly at the stage of grape processing, technological treatment, and storage.

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