Cite this asBharti VK, Giri A, Kumar K (2017) Evaluation of Physico-Chemical Parameters and Minerals Status of Different Water Sources at High Altitude. Ann Environ Sci Toxicol 2(1): 010-018. DOI: 10.17352/pjest.000007
Physico-chemical properties and minerals status is an important decisive factor for assessment of drinking water quality. There are limited literatures on this aspect for drinking water quality of high altitude areas; therefore, the present investigation was carried out to evaluate different physico-chemical parameters and some essential minerals status in different drinking water sources. These water samples were collected from different sources like deep tube well, spring, and river from different villages of Leh District, Jammu & Kashmir, India. Thereafter, it was analyzed for physico-chemical parameters viz. dissolve oxygen, alkalinity, hardness, chloride, phosphate, sulphate, and nitrate according to standard methods. Similarly, all the essential minerals viz. sodium, calcium, magnesium, potassium, iron, sulphur, and manganese were analyzed by using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). All the results were compared with the WHO standard for drinking water. The findings of this investigation indicated that dissolved oxygen, alkalinity and hardness were above the desirable level at some places as per WHO standards. Whereas, chloride, nitrate, and sulphate levels were lower in all the water samples collected across the sources. Among all the minerals, iron, potassium and aluminium level were above and sodium, magnesium, and manganese were lower than the desirable level at all the different altitude as per WHO standards. Interestingly, chloride, sodium, sulphur and aluminium level were high in Indus river water collected from the nearby city area. Therefore, it can be concluded that water sources near the city area are more contaminated than the other sites. Hence, present findings indicated variation in physico-chemical parameters and mineral status of water of different sources of high altitude Himalayan region. More or less, the quality of drinking water is suitable for consumption except the hardness and aluminium level.
Water is an essential component of our food and contributes to many minerals nutrients, too [1,2]. Important natural sources of water are surface water such as lakes, streams, river, pond, etc. and ground water such as bore well and wells . Fresh water is essential for agriculture, industry, domestic use, and drinking purpose for human and animals . Water quality depends upon the physical, chemical, minerals, and biological characteristics of water . Hence, animal and human health as well as sustainable agricultural and industrial development will not be possible without availability of quality fresh water in adequate quantity . In general, water sources are less anthropogenic contaminated in Himalayan region as compared to plain areas due to less industrial growth and low human population with comparison to plain areas. However, in recent years due to increase in human population, tourism, and industrialization, water sources are brink of contamination on indiscriminate waste disposal. Leaching of this water into ground water at different strata of rock further contribute to ground water contamination [7-9]. Recently, due to environmental pollution, several surface water sources are not acceptable for drinking as these are often contaminated with various organic, inorganic, and microbial agents [6,7,10-15]. According to WHO, about 80% of all the diseases in human beings are caused by water? It is therefore becomes imperative to regularly monitor the quality of water and to device ways and means to protect it . Some reports on soil, water and fodder minerals status indicated deficiency or excess of some minerals at high altitude [17,18]. Since, physico-chemical properties and mineral status are interlinked with mineral availability of water. The composition of surface and groundwater vary with the altitude, topography, hydrological and biological present in the drainage basin [19,20]. Therefore, evaluation of different sources of water collected from different altitude is essential for knowing their suitability for drinking purpose. Since, the scanty of literatures on water quality of high altitude collected from different sources; therefore it is important to evaluate physico-chemical properties and minerals status. Therefore, we investigated physico-chemical parameters and some minerals in all the water collected from different sources at high altitude. This study will help in identification of good water sources and developing remedial measures for water resource management at high altitude.
The study area occupies a part of the Indus river valley. The Indus River in the study area flows throughout the year. The overall drainage system is controlled by the river and many canals which are filled through glacier melted water. In the summer season, irrigation is fully dependent on these canal systems. The characteristics of rocks in this region are igneous, metamorphic and sedimentary in nature. They have Tertiary granitic batholith of Ladakh. The area remained magmatically active from Cretaceous to post-Oligocene period. They are shale and limestone. Leh plains are underlain by moraine deposits consisting of boulders, cobbles, pebbles embedded in an arenaceous matrix and lake deposits comprising predominantly of clays, sandy clays and silt. Ground water development through construction of tube wells and hand pumps is very much possible in this district. Till date ground water development in this district was in ancient stage. People mainly depend on surface water sources and springs for meeting water supply requirements. Thus, the stage of ground water development is least .
In this study, tube well water (26 total sites), spring water (02 total sites) and river water (05 total sites) were collected from different sites/places at different altitude of Leh district, Jammu & Kashmir, India in the winter season of 2013. Collection sites are located in the cold, arid Himalayan region of India, where the altitude varies between 10465-11884 ft above mean sea level (MSL). Different altitude, latitude and longitude of all the sampling sites/places were recorded by GPS system (Model no. Garmin GPS 72H) and distance of sites/places from main city/industry were given in Table 1 followed by the sampling location map made by the Google Earth 6.1 and QGIS 2.12 software (Figure 1).
The water samples were collected from different sites in plastic bottles, which were previously washed with detergents and HNO3 acid and later rinsed with sampled water several times. Total 1.5mL of 2M HNO3 was added to each 100mL samples (pH<3) for metallic ions determination to maintain the stability of the oxidation state of the various elements in solution and prevent precipitation .
All the water samples were analyzed for dissolve oxygen, alkalinity, hardness, chloride, phosphate, sulphate, nitrate, sodium, calcium, magnesium, potassium, iron, sulphur, manganese and aluminium of tube well, spring water and river water as per standard procedures used for water analysis. All the analytical methods are briefly described below and given in Table 2.
DO was determined by Winkler method . Alkalinity was estimated by titrimetric method . Total Hardness and calcium hardness was determined by complex metric titration using Eriochrome Black-T as an indicator by EDTA method and Chloride was estimated by Mohr’s method using AgNO3 solution and Potassium Chromate as an indicator . Sulphates and Nitrates were estimated by UV-Visible Spectrophotometer (Biosync Tecknology Pvt Ltd, Model no.-LT2900) , inorganic phosphates were determined by UV-Visible Spectrophotometric method . All the minerals viz.Ca, Na, K, Mg, Mn, Fe, S and Al level were estimated by using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) (Perkin-Elmer Analyst, Optima 7000 DV).
Six samples collected from each sites of different water sources were calculated by Microsoft excel worksheet and all the analyzed data were compared with recommended World Health Organization (WHO) standard values given in Table 3 .
The parameters like dissolve oxygen, alkalinity, hardness, chloride, sulphate, phosphate, and nitrate are important indices of quality water [2,26,27]. Dissolved oxygen (DO) is very important parameter in water assessment . DO is governed by the water turbulence, surface diffusion, rate of photosynthesis, biological oxygen demand (BOD), water temperature, and carbon dioxide concentration [29,30]. In the present study, levels of DO in all the three sources are higher than the WHO prescribed guidelines (Figure 2). Level of dissolve oxygen in water depends upon the wind action and speed of water flow. As the river and spring water flowing, it has the open chances of water to mix up with natural oxygen. For these reason, river water and spring water might have higher dissolve oxygen level than the WHO prescribed limits. However, the quality of water is good for the aquatic habitat.
The Alkalinity of water is its capacity to neutralize a strong acid. It is normally due to the presence of carbonates, bicarbonates and hydroxides compounds of Ca2+, Mg2+ and Na+ . Water bodies having total alkalinity (Table 4, Figure 3) above 50mg/L can be considered productive. Therefore, in the study area it might be said that water sources are highly productive . However, in this region, soil showed the alkaline in nature [17, 18]. This is the most probable reason for showing the higher level of alkalinity in all the three water sources than the WHO guidelines.
Hardness is the property of water, which is due to the salts of Ca2+ and Mg2+ [31,33]. Level of hardness (Table 4, Figure 4) was higher in most sampling sites than the desirable limits prescribed by WHO guideline. Low magnesium level and high hardness value in the study sites indicates that hardness is mainly due to calcium level.
Chlorides usually occur as NaCl, CaCl2, MgCl2, and in widely varying concentration in all natural water . An increase in the number of chloride (Cl-) content of water may indicate possible pollution from human sewage, animal manure or industrial wastes . In the present study, chloride concentration (Table 5, Figure 5) was below the permissible level of WHO guidelines. In the winter season, all the mentioned probable sources of chlorides to water remain low. For this reason, all the three water sources showed the lower level than the WHO guidelines.
Phosphate (PO43-) may occur in groundwater because of domestic sewage, detergents, agricultural effluents with fertilizers and industrial waste water . The phosphate content in most of the study area was not detectable (Table 5). Since, all the samples were collected in the winter season. During winter season, domestic sewage is very low and no agriculture activity. Moreover, not much industry has been established, hence phosphate contaminants was under detectable limit.
Sulphate (SO42-) occurs naturally in water because of leaching from gypsum and other common minerals . Low levels of sulphate (Table 5, Figure 6) in the study area were indicating low level of leaching from the igneous, metamorphic and sedimentary rocks of this region.
Nitrate (NO3-) being the highly oxidized form of nitrogen compounds, which is present in the surface and groundwater sources . Significant sources of nitrates are fertilizers, decayed vegetable and animal matter, domestic and industrial effluents and atmospheric washouts. In our study, nitrate concentration (Table 5, Figure 7) was below the permissible limit in all sources of water. Therefore, it might be said that drinking water might be free from hazardous sources as mainly the zero levels agricultural system.
Sodium (Na) concentration plays an important role in evaluating the groundwater quality for irrigation because sodium causes an increase in the hardness of soil as well as a reduction in its permeability . For the low level of sodium concentration (Figure 8) in the study area, cultivation might be affected with low production.
The major source of potassium (K) in natural fresh water is weathering of rocks but the quantities increase in the polluted water due to disposal of waste water . Average potassium level was higher in the nearby city area. Therefore, it can be said that, disposal of waste water in water sources nearby city area is more than the other area. Ruminants are largely depends on non-protein nitrogen sources, such as urea, biuret, or ammonium phosphate. Inadequate level of sulfur in the study area might be effect on the feed intake, digestibility, rate of weight gain, and milk production . Manganese (Mn) is often associated with calcium in all kinds of waters, but its concentration remains generally lower than the calcium . In this study, low levels of Mn can potentially lead to a decrease in overall animal growth . In most of the analyzed water samples, iron and aluminium were above the permissible limit. Most of the groundwater samples contain iron and aluminum in trace amounts in practically all sediments and rock formations [25,42]. So, it may have adverse effect on long-term consumption of these water [43,44]. Hence, these findings indicated contamination of some water sources at certain sites, which seem to be investigated in time-to-time for devising some remedial measures. As this is a first time report on these parameters and different water sources at high altitude, however further studies are required to analyze more samples collected across the location in different seasons for comprehensive understanding of these variations in physico-chemical and mineral parameters (Table 6, Figure 9-13).
Overall quality of the drinking water has shown higher level of alkalinity, hardness, potassium, iron, and aluminium level. High alkalinity and hardness of water may be corrected boiling followed by the filtration. However, gravity or reverse osmosis (RO) based multi staged filter would be useful for removal of excess inorganic salts and minerals. Since, the high altitude region has limited electricity coverage, so RO filter may not be feasible and gravity based filter has limited capacity to remove the soluble metal salt contaminants. Hence, research should be undertaken to develop economic and user friendly individual or community based water treatment system using activated charcoal, nanoadsorbant, metal chelators, etc.
The present investigation findings indicated variations in physico-chemical parameters and mineral status of water of different sources. Further, there was wide variation of water quality constituents among different sources of water. Physical parameters like alkalinity and hardness were higher than WHO standard level at different altitude. Among minerals, iron, potassium and aluminium level were more than the prescribed ground water quality limits by WHO. Interestingly, chloride, sodium, sulphur and aluminium level were high in Indus river water collected from the nearby city area. Therefore, it can be concluded that water sources near the city area are contaminated. However, more or less, the quality of drinking water is suitable for consumption except the hardness and aluminium level. Though, this study finding further advocates the extensive study on water quality of different sources at high altitude.
The Authors are thankful to Director, DIHAR and Defence Research and Developmental Organization (DRDO), New Delhi, India, for financial support. We are also thankful to technical staffs and SRF Prabhat Kumar for their help throughout the sampling period and technical assistance, Sahil Kapoor, SRF for drawing map.
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