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Study of physico-chemical parameters and presence of heavy metals in underground water of rural areas of pune

Nirmala Chiwadshetti1*, Rekha Israni2

1Bhagwant University, Ajmer, Rajasthan, India

2Bhagwant University, Ajmer, Rajasthan, India

*Corresponding Author:
Nirmala Chiwadshetti
Bhagwant University, Ajmer, Rajasthan, India.
E-mail: [email protected]

Received date: 30/08/2021; Accepted date: 10/09/2021; Published date: 07/10/2021

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Abstract

In this research, an endeavour has been made to study physicochemical parameters as an attempt to provide the water industry with an updated understanding of factors that influence the potability of water. Corrosion especially in terms of Iron is one of the most critical problems faced by drinking water facilities. Many Parameters affect pipe corrosion, including water quality and composition, flow conditions, biological activity, and corrosion inhibitors. In this study, potability of water was studied along with 30 different parameters. In particular, this article focuses on underground water and its potability studies. Various physicochemical parameters as well as heavy metal contents of water samples were studied. The results showed that underground water samples of residential area were not only containing traces of heavy metals but also were showing remarkable hardness.

Keywords

Underground water, potability, heavy metals, physicochemical parameters

Introduction

It is well known fact that neat clean drinking water is absolutely essential for healthy living. Many areas of ground water and surface water are now contaminated with heavy metals, persistent organic pollutants and anti-nutrients that can adverse effect on health. Contamination of water can cause water borne diseases [1]. Physico-chemical analysis is of prime importance to access the quality of water for its cost usage like drinking, bathing, fishing, industrial processing etc, and to get idea about pollution load of domestic sewage and industrial wastes on receiving water bodies [2]. Quantitative analytical procedures can be done by gravimetric, volumetric, colorimetric estimations and hyphenated techniques such as GCMS (Gas Chromatography-Mass Spectroscopy)[3].

Materials and Methods

Sampling for Chemical analysis

The water samples are collected from residential areas of rural pune, at depth of 0.5 meter in case of open water bodies and in case of piped water supply system from the tap in the thoroughly cleaned jar or natural gas container of minimum 5 liter of capacity provided with double cap device. The samples were collected upto top without living any space so as to prevent the premature release of dissolved gases during the transit period [4].

Physico-chemical analysis

Physico chemical analysis of water includes study of following parameters,

  1. Mineral analysis - comprising physical, parameters and significant cations and anions.
  2. Demand analysis - including biological oxygen demand (BOD), chemical oxygen demand (COD), dissolved oxygen (DO), and total organic carbon (TOC).
  3. Nutrient analysis - consisting analysis of different forms of nitrogen and phosphorus.
  4. Trace determinants including metal analysis, organic analysis and pesticide analysis [5].
  5. In this study 30 different parameters were selected. These include primary parameters such as Colour, pH, Turbidity, Total Alkalinity, Total Hardness, Chlorides, Total Dissolved Solids, Iron, Sulphates, Magnesium, Calcium, Conductivity. These also include, Metal analysis such as Aluminium, Flouride, Boron, Molybdenum, Nickel, Selenium, Sulphide, Phenolic Compounds, Anionic Detergents, Zinc, Nitrate, Chromium, Cadmium, Copper, Lead, Mercury, Arsenic, Manganese [6].
  6. All the Parameters were studied by referring standard operating procedures as per worldwide guidelines of water testing.

Results and Discussion

Physico-chemical analysis

The results of Physico-chemical Analysis and Heavy Metal Analysis are reported in Table 1 and 2. The Indian standard and the WHO standard for physical appearance, odour and taste are agreeable. In the present study also the water samples showed results as colourless, odourless and agreeable to these three parameters and hence water can be considered for human consumption [7].

Sr.No Parameters Units Results Limits
(IS:10500-2012)
Method of Test
1 Colour Hazen BDL 5.0-15 EPA 6010c
2 pH ............ 8.29 6.5 - 8.5 IS 3025(Part 11)
3 Turbidity NTU Nil 1 (Max) IS 3025(Part 10)
4 Total Alkalinity(as CaCO3) mg/Litre 430.0 200 ( Max) IS 3025(Part 23)
5 Total Hardness(as CaCO 3) mg/Litre 450.0 200 ( Max) IS 3025(Part 21)
6 Chlorides(as Cl) mg/Litre 103.79 250 ( Max) IS 3025(Part 32)
7 Total Dissolved Solids (TDS) mg/Litre 780.0 500 ( Max) IS 3025(Part 16)
8 Iron (as Fe) mg/Litre 0.3 0.3 ( Max) IS 3025(Part 53)
9 Sulphates (as S04) mg/Litre 67.50 200 ( Max) IS 3025(Part 24)
10 Magnesium (as Mg) mg/Litre 34.440 · 30 (Max) IS 3025(Part 46)
11 Calcium (as Ca) mg/Litre 124.24 75 (Max) IS 3025(Part 40)
12 Conductivity at 25 ° C µmhos/cm 1392.8 --- ---

Table 1: Important Physicochemical Parameters of Water Analysis

Sr.No Parameters Units Results Limits
(IS:10500-2012)
Method of Test
13 Aluminium mg/Litre 0.02 Max 0.030 EPA 6010c
14 Flouride mg/Litre 0.64 Max 0.1 EPA 6010c
15 Boron(As B) mg/Litre 0.22 Max 0.5 APHA 3120B,EPA
6010c
16 Molybdenum mg/Litre BDL Max 0.07 EPA 6010c
17 Nickel mg/Litre BDL Max 0.02 EPA 6010c
18 Selenium mg/Litre BDL Max 0.01 EPA 6010c
19 Sulphide mg/Litre BDL Max 0.05 EPA 6010c
20 Phenolic Compound(C6H5OH) mg/Litre BDL Max 0.001 SFA
21 Anionic Detergents as MBAS mg/Litre 0.500 Max 0.2 SFA
22 Zinc (as Zn) mg/Litre BDL Max 5 EPA 6010c
23 Nitrate mg/Litre 12.320 Max 45 IS 3025(Part 34)
24 Chromium mg/Litre 0.01 rvlax 0.005 EPA 6010c
25 Cadmium m_g/Litre BDL Max 0.003 EPA6010c
26 Copper(Cu) mg/Litre BDL Max 0.05 EPA 6010c
27 Lead (Pb) mg/l 0.023 Max 0.01 EPA 6010c
28 Mercury mg/Litre BDL Max 0.001 EPA 6010c
29 Arsenic mg/Litre 0.016 Max 0.01 EPA 6010c
30 Manganese mg/Litre BDL Max 0.1 EPA 6010c

Table 2: Element (Heavy Metal) Parameters of Water Analysis

Turbidity

Turbidity values are well within limits. The pH values ranges to 8.29 which complies with the limits. The TDS value recommended by BIS & WHO are 500 but TDS values found higher for samples making these samples are unfit for human consumption and thereby it leads to necessity of RO filter system at every house.

Conductivity

The specific conductance ranged from 1392.8 μmhos/cm. It shows that water has very low electrical conductivity implying the presence of reduced ion species.

Concentration of chloride ions

Concentration of Chloride ions was between 103.79 mg/lit. The limits are 250 mg/lit, in all the samples the amount of chloride ions is within the limiting values indicating lesser degree of water pollution. This confirms the compatibility of chloride ions within the prescribed limit.

Nitates and Nitriets

Nitrates and Nitriets observed in samples are below prescribed range. The nitrates and nitrites were 12.320 mg/lit which are well within the limit of 45 mg/lit.

Total hardness

The excessive limit of total hardness is 200 mg/L. But in the analysis of given samples the total hardness values exceeds the limit as 450mg/L, hence water from these bore-wells are unfit for drinking purpose. The hardness may be due to addition of calcium and magnesium by soap washings and water can be used for general washing purposes [8].

Alkalinity

The values of alkalinity are found to be higher than the prescribed range and therefore water is unsafe for drinking but can be used after proper treatment

Iron

Iron as Fe found ranging from 0.3 mg/L which is around the boundary of the prescribed limit & hence, it can be considered that there is less amount of corrosion to the pipes.

Fluoride

The value of fluoride content shows a value between 0.6 mg/lit which is too high compared to the limit.

Calcium

The value prescribed for Ca is 75, water sample showed 124.24 which is higher than acceptable limits.

Magnesium

The value of magnesium is 34.44 mg/L which is slightly higher compared to standard of 30 mg/L [9].

Heavy metals analysis

Arsenic– Arsenic observed in the samples was slightly above to prescribed range.

Lead – The value of lead in the sample was found higher than prescribed limit.

Cadmium – Values of cadmium in the sample was Below Detection Limit.

Mercury – Mercury was found totally absent in the water sample [10].

Conclusion

The values of all 30 parameters measured for collected water samples are far low in many cases but 8 parameters were having higher readings than the acceptable limit, which indicates the nature of ground water in this region is non-potable and but of course, can be used for drinking purposes only after proper disinfection and certainly this indicates the necessity of RO Filters for every house in the region.

References

https://lechoixdeslibraires.com/