Data on corrosion and scaling potential of drinking water resources using stability indices in Jolfa, East Azerbaijan, Iran

This cross-sectional study was conducted on the drinking water resources of the city of Jolfa (East Azerbaijan province, Iran) from samples taken from 30 wells. Calcium hardness, pH, total alkalinity, TDS, temperature and other chemical parameters were measured using standard methods. The Langelier, Rayzner, Puckhorius and aggressive indices were calculated. The results showed that the Langelier, Reynar, Puckorius, Larson-skold and aggressive indices were 1.15 (± 0.43), 6.92 (± 0.54), 6.42 (± 0.9), 0.85 (± 0.72) and 12.79 (± 0.47), respectively. In terms of water classification, 30% of samples fell into the NaCl category and 26.6% in the NaHCO3 category and 43.4% samples in the CaHCO3, MgHCO3 and MgCl category. The sedimentation indices indicated that the water of the wells could be considered as corrosive.


a b s t r a c t
This cross-sectional study was conducted on the drinking water resources of the city of Jolfa (East Azerbaijan province, Iran) from samples taken from 30 wells. Calcium hardness, pH, total alkalinity, TDS, temperature and other chemical parameters were measured using standard methods. The Langelier, Rayzner, Puckhorius and aggressive indices were calculated. The results showed that the Langelier, Reynar, Puckorius, Larson-skold and aggressive indices were 1.15 ( 7 0.43), 6.92 (7 0.54), 6.42 ( 7 0.9), 0.85 ( 7 0.72) and 12.79 ( 7 0.47), respectively. In terms of water classification, 30% of samples fell into the NaCl category and 26.6% in the NaHCO 3 category and 43.4% samples in the CaHCO 3 , MgHCO 3 and MgCl category. The sedimentation indices indicated that the water of the wells could be considered as corrosive.
&  Table   Subject area  Chemistry  More specific subject area   Describe narrower subject area   Type of data  Tables, Figure  How data was  acquired To calculate the corrosion indices, 120 water samples were collected, stored and transferred to the lab using standard methods and the water quality parameters such as temperature, electrical conductivity, total dissolved solids, pH, dissolved oxygen, calcium hardness, alkalinity, chloride and sulfate were measured. The gravimetric method was used to measure the dissolved solids and the titration method was used to determine alkalinity. Sulfate ions were measured based on turbidity measurement at 420 nm using a DR5000 spectrophotometer. Residual chlorine and pH measurement was carried out using test kits and water temperature was measured with a thermometer at the sampling points Data format Raw, Analyzed Experimental factors

Specifications
The mentioned parameters above, in abstract section, were analyzed according to the standards for water and wastewater treatment handbook.

Experimental features
The levels of physical and chemical parameters were determined.

Data source location
Jolfa, East Azerbaijan province, Iran Data accessibility The data are available whit this article

Value of the data
Calculation of corrosion indices showed that the chemical quality of the water was imbalanced and could cause corrosion to the water system and other facilities.
The water quality and the potential for corrosion in all distribution systems is necessary to avoid economic loss and avert adverse effects on health.
Comparison of five stability indices showed that water conditions in all parts of this study are supersaturated.

Data
The data presented here deals with monitoring of the physical and chemical properties of pH, EC, , CL − , Ca 2 þ , Mg 2 þ and Na þ as shown in Tables 2 and 3, respectively. The results of the calculations for the Langelier, Ryzener, Puckorius, Aggressive and Larson indices are presented for Jolfa in Table 4. All indices other than the AI index indicated that the water is corrosive. The Langelier index was greater than zero in 90% of samples. Based on the average of this index, the water can be classified as supersaturated; thus, according to the Langelier index, the water is not corrosive. In all samples, (60%) the Ryzener index was between 6 and 7 and it can be concluded that the water samples are saturated ( Table 4). The water samples were classified as 30% in the NaCl category, 26.6% in the NaHCO 3 category and 43.4% in the CaHCO 3 , MgHCO 3 and MgCl category ( Table 5).

Study area description
Jolfa is the capital of Jolfa county in East Azerbaijan province in Iran. Jolfa county is located in northern East Azerbaijan province at UTM coordinates of X ¼ 45.17 to 46.31 east longitude and Y ¼ 38.39 to 39.2 north latitude. The city borders the river Aras and the autonomous republic of Nakhchivan and the Republic of Armenia and Azerbaijan to the north [ Fig. 1].

Sample collection and analytical procedures
To calculate the corrosion indices, 120 water samples were collected, stored and transferred to the lab using standard methods and the water quality parameters such as temperature, electrical conductivity, total dissolved solids, pH, dissolved oxygen, calcium hardness, alkalinity, chloride and sulfate were measured. The gravimetric method was used to measure the dissolved solids and the titration method was used to determine alkalinity. Sulfate ions were measured based on turbidity measurement at 420 nm using a DR5000 spectrophotometer. Residual chlorine and pH measurement was carried out using test kits and water temperature was measured with a thermometer at the sampling points [5][6][7][8][9][10][11]. The equations of the corrosion indices and their interpretations are summarized in Table 1. Table 1 Summary of water stability indices in present study [1][2][3][4].    Table 3 Physical and chemical characteristics of water quality of distribution networks of Jolfa city.