The investigations of POPs in soil and air in three urban and rural sites of the Mongolia are presented. The POPs distribution in air repeats the POPs distribution in soil on the area investigated. The POPs levels in soil and air are lower than maximum permissible concentrations (MPC) and preliminary permissible concentrations (PPC) of PCBs and OCP accepted in Russia. POPs levels in Mongolian soil obtained in the investigation are comparable with those from background areas of the world. POPs levels in Mongolian air are in the frame of concentrations found in the world. The PCB homological pattern in soil near electric power station in Ulaanbaatar is close to homological pattern in PCB technical mixture (Sovol or Arochlor 1254). The homological patterns in soil from other sites changed due to the redistribution of PCB congeners in the environment. The ratio of DDT and its metabolites indicates fresh entrance of DDT in the environment of Mongolia due to the atmospheric transboundary transport from countries using DDT (China, India) or from local agricultural sources. Hazard indexes in result from human exposure with POPs in soil and air are lower by 2-4 orders than 1 that denotes the possible default of disturbances in target organ and system. CR under the same scenario corresponds to the first diapason that is taken by population as negligible risk, not differ from usual everyday risks. Such risks don’t require additional measures for the reducing of risks and their levels are a subject of periodical control. The necessity of additional investigation of POPs distribution and the fate in Mongolian environment is indicated.DOI: http://dx.doi.org/10.5564/mjc.v12i0.176 Mongolian Journal of Chemistry Vol.12 2011: 69-77

The distribution of organochlorine pesticides in surface soils from Mongolia Organochlorine pesticides (OCPs) were measured in (59) soil samples in urban and background and rural areas throughout Mongolia to fill up the gap in data on OCPs in soil in Central Asia. The median of γ-HCH+γ-HCHs, p,p`-DDT+p,p`-DDE+p,p`-DDD and HCB comes to 0.02, 0.16 and 0.02 ng/g dry weight (DW) respectively. OCPs levels in soils from rural and background regions of Mongolia are comparable or lower than those obtained in soil of remote and mountain areas of the world. The distribution of HCHs and DDTs indicates a predominance of γ-HCH entrance in the greater part of the soil sampled throughout Mongolia and confirm limited DDT application in the country at presence or in past. The influence of some factors including land use, soil organic carbon, natural zones and latitude on OCP distribution in surface soils in Mongolia was found. It is associated with the extensive development of agriculture and stockbreeding and therefore more extensive usage of OCP before ban in central and northern parts of Mongolia. The highest mean of OCP level in soil of the mountain taiga zone differs significantly from those in forest-steppe, steppe, and Govi (the Gobi) zones.

This study purposed to evaluate the water quality of 10 points located between the Terelj national park and the Lun soum in Tuv province along the Tuul River, depending on assessing detailed Physico-chemical and seasonal (except than winter) pollution indicators. The chemical data of water samples from the Tuul River illustrated the water type from neutral to slightly alkaline and belonged to the HCO3-- Ca2+; HCO3-, SO42--Na+ and HCO3-- Ca2+, Mg2+. The point of Terelj or, moreover, starting points water belongs to excellent water, but water mineralization in the mid of Ulaanbaatar city increased up to 1.2 times. However, mineralization, anions and cations of T6 mixed with wastewater from the Central Wastewater Treatment Plant (CWTP) increased significantly. These parameters decreased along the downstream river at T9, T10 points in the zone of Lun soum. As nutritional polluting constituents like NH4-N, NO2-N, PO4-P, COD concentrations met the permissibility of National Standard (MNS 4586:98) requirements at T1-T5 points in Terelj and Ulaanbaatar city. On the contrary, ranges are overrated by permissible concentration of MNS 4586:98 at T6 point mixed with wastewater from CWTP. In T9, T10 points case, nutritional pollution is being decreased gradually along the river, but natural self-treatment did not process completely. Water quality index (WQI) of Terelj and mid of the city (T1-T5 points) designated as ‘excellent’ and ‘good’ (I-II), inappropriately at the point T6 appointed as ‘very poor’ to ‘unsuitable’ water (IV-V) categories. Interestingly, T7 to T10 issues contributed as ‘poor’ to ‘very poor’ water (III-IV) categories. Улаанбаатар хот орчмын Туул голын усны чанарын судалгаа Хураангуй: Туул голын урсгалын дагуу Тэрэлжээс Төв аймгийн Лүн сум хүртэлх 10 цэгээс улирал тутам дээж цуглуулан физик-химийн болон бохирдлын үзүүлэлтийг тодорхойлон, усны чанарын судалгааг явуулсаны үндсэн дээр бохирдлын түвшинг тогтоон дүгнэлт өгөх зорилгоор энэхүү ажлыг хийж гүйцэтгэсэн болно. Туул голын ус нь саармагаас бага шүлтлэг орчинтой, HCO3-- Ca2+; HCO3-, SO42--Na+ ; HCO3-- Ca2+, Mg2+. төрлийн холимог найрлагатай усны ангилалд хамаарагдаж байна. Голын эх буюу Тэрэлжийн бүс нэн цэнгэг усны ангилалд хамаарагдаж байсан бол Улаанбаатар хот орчмын бүсийн голын усны эрдэсжилт ойролцоогоор 1.2 дахин нэмэгдсэн байна. Харин Төв цэвэрлэх байгууламжийн хаягдал бохир ус нийлсэн (Биокомбинатын Т6) цэгт голын усны эрдэсжилт болон бусад анион катион ихээхэн нэмэгдэж байгаа боловч Лүнгийн бүсийн Т9, Т10 цэгт байгалийн усны өөрөө цэвэрших явцын дүнд нийт эрдэсжилт болон хатуулаг буурах зүй тогтол ажиглагдсан. Шим бохирдлын үзүүлэлт болох аммонийн азот, нитритийн азот, исэлдэх чанар, эрдэс фосфорын агуулга Тэрэлж, Улаанбаатар хотын бүсэд (T1-T5) цэгт стандартын утгаас хэтрээгүй байсан бол T6 цэгт огцом нэмэгдэж стандартын утгаас давсан байна. Харин Лүнгийн бүсийн Т9, Т10 цэгүүдийн хувьд шим бохирдлын үзүүлэлт урсгалын дагуу аажим буурч байгаа хэдий ч голын эхэн хэсэгтэй харьцуулахад гүйцэд цэвэрших процесс явагдаагүй нь харагдаж байна. Мөн Туул голын ус эхэн хэсэгтээ буюу Тэрэлж, Улаанбаатар хот орчмын бүсэд (T1-T5 цэг) “Маш цэврээс цэвэр” (I-II) усны ангилалд хамаарагдаж байсан бол Т6 цэгээс “Бохирдолтойгоос их бохирдолтой” буюу IV-V зэрэглэл рүү, харин Т7-Т10 цэгт усны чанар “Бохирдолтойгоос бага бохирдолтой” (III-IV) ангилал руу шилжиж буйг тогтоолоо.Түлхүүр үг: Туул гол, шим бохирдол, усны чанарын индекс, химийн найрлага

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