15 research outputs found
PRENATAL ULTRASOUND IRRADIATION AS AN UNDERESTIMATED RISK FACTOR FOR THE BIRTH OF CHILDREN WITH DIFFERENT ABILITIES (AKA SPECIAL EDUCATIONAL NEEDS)
Get PDFThe increasing number of pathological conditions among children nowadays and in the past decades is the main reason for writing this paper and conducting the study described in it. Some of the conditions referring to in this article are: autism and autism spectrum disorder (ASD), dyslexia, late onset of speech, epilepsy, attention deficit hyperactivity disorder (ADHD), emotional and behavioural disorders. By the means of observation we can conclude that the current prevalence of these conditions and others as well, are pandemic, especially in the developed countries. The main question we search the answer to in this text is: “Is there any direct or indirect relation between the routine ultrasound irradiation scanning during pregnancy and the number and severity of the disabilities in the children affected by it?” The summarized results from a self-initiated and conducted study on the subject are presented in this paper. The study is realized in the period of eight years (2011-2019), however, here a more than four years data is summarized. The first four years the researcher spend time applying semi-structured interview to different people involved in the ultrasound checking (obstetricians, midwives, doulas, parents) while the rest four years she disseminated a questionnaire addressed to pregnant women and mothers of children with different abilities (aka special educational needs) and typical development children. The author concludes that there is absolute necessity for change in the medical routine practice applied to healthy pregnant women with low-risk pregnancies – both nationally, in Bulgaria where the study is conducted, and internationally – for the sake of children’s health and the need of informed consent of parents before the procedure is applied to the unborn, fragile and unprotected child. The effects of ultrasound wave’s irradiation on the mothers’ health should not be underestimated either. Article visualizations
Chemical Treatment of Highly Toxic Acid Mine Drainage at A Gold Mining Site in Southwestern Siberia, Russia
No full textThe critical environmental situation in the region of southwestern Siberia (Komsomolsk settlement, Kemerovo region) is the result of the intentional displacement of mine tailings with high sulfide concentrations. During storage, ponds of acidic water with incredibly high arsenic (up to 4 g/L) and metals formed on the tailings. The application of chemical methods to treat these extremely toxic waters is implemented: milk of lime Ca(OH)2, sodium sulfide Na2S, and sodium hydroxide NaOH. Field experiments were carried out by sequential adding pre-weighed reagents to the solutions with control of the physicochemical parameters and element concentrations for each solution/reagent ratio. In the experiment with Ca(OH)2, the pH increased to neutral values most slowly, which is contrary to the results from the experiment with NaOH. When neutralizing solutions with NaOH, arsenic-containing phases are formed most actively, arsenate chalcophyllite Cu18Al2(AsO4)4(SO4)3(OH)24·36H2O, a hydrated iron arsenate scorodite, kaatialaite FeAs3O9·8H2O and Mg(H2AsO4)2. A common specificity of the neutralization processes is the rapid precipitation of Fe hydroxides and gypsum, then the reverse release of pollutants under alkaline conditions. The chemistry of the processes is described using thermodynamic modeling. The main species of arsenic in the solutions are iron-arsenate complexes; at the end of the experiments with Ca(OH)2, Na2S, and NaOH, the main species of arsenic is CaAsO4−, the most toxic acid H3AsO3 and AsO43−, respectively. It is recommended that full-scale experiments should use NaOH in the first stages and then Ca(OH)2 for the subsequent neutralization
DAILY DYNAMICS OF ELECTRICAL RESISTVITY AND GAS EMANATIONS ABOVE ABANDONED MINE WASTES (UR DUMP, WESTERN SIBERIA, RUSSIA)
No full textThe Combination of Geoelectrical Measurements and Hydro-Geochemical Studies for the Evaluation of Groundwater Pollution in Mining Tailings Areas
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Environmental assessment criteria of the Arctic area affected by the technological influence, taking into account the features of the regional background
No full textGeophysical investigations for evaluation of environmental pollution in a mine tailings area
No full textAcid Mine Drainage Migration of Belovo Zinc Plant (South Siberia, Russia): A Multidisciplinary Study
No full textTransfer of chemical elements in vapor-gas streams at the dehydration of secondary sulfates
No full textThe elemental composition of vapor-gas streams obtained during heating of secondary hydrous sulfates are presented. Samples of abundant sulfate intergrowth were collected at the Belovo waste heaps and heated at 60ºC in experiments to collect condensates of the releasing vapor-gas streams. A wide spectrum of major and trace elements was determined in the condensate. Chemical elements can be absorbed by the water vapor and migrate with this phase during the dehydration of hydrous sulfates. To determine the mechanisms of migration and the sources of elements in vapor-gas streams, a study of the features of certain hydrous sulphates (antlerite, goslarite, starkeyite, gunningite, siderotile, sideronatrite) by stepwise heating up to 60ºC was conducted. Alteration in the phase composition is controlled by powder X-ray diffractometry. It was determined, that antlerite and starkeite remain stable throughout the temperature range. The beginning of the separation of structural water in goslarite and siderotile occurs at 40°C. Goslarite and sideronatrite at 40°C lost water molecules and transformed to gunningite and Na-jarosite, correspondingly. Structure of siderotile was loosened. The modes of occurrence of the chemical elements in sulfates and pore solution determine the concentrations of elements in the condensates
