Open access peer-reviewed chapter

Method OF INAA for Critical Evaluation Pollution of Ecosystem

By Blanka Maňkovská and Július Oszlányi

Submitted: November 10th 2010Reviewed: March 23rd 2011Published: September 6th 2011

DOI: 10.5772/20867

Downloaded: 1314

1. Introduction

The heavy metals in mosses biomonitoring network was originally established as a Swedish initiative (Rűhling, Tyler, 1968, 1971). It is assumed that in Slovakia (SK) a large gradient of atmospheric deposition load of elements exists, because part of the SK territory belongs to one of the most polluted areas in central Europe known as the ‘Black Triangle II’. In order to recognise the distribution of element deposition in SK, the moss monitoring technique, also known as bryomonitoring, was applied to the whole territory in 1990, 1995, 1996, 1997, 2000 and 2005 (Maňkovská, Oszlányi, 2008). Bryomonitoring is a suitable technique using moss analysis to determine the levels of atmospheric deposition of the elements. The technique has been highly standardised and international bryomonitoring programs coordinated by Nordic countries have a pan-European character (Harmens et al.2008; Maňkovská, 1997; Maňkovská et al. 2003; 2008a; 2008b; Schröder et al.2008; Suchara et al. 2007; Zechmeister et al. 2003). These are characterized by a high concentration of toxic elements such as As, Cd, Cr, Cu, Hg, Fe, Mn, Ni, Pb, V and Zn. The aim of this paper is to present actual data of the first survey of 9 elements in mosses (P. schreberi, H. splendens and Dicranum sp.) in five Slovak sites: National parks (Vysoké Tatry, Nízke Tatry, Západné Tatry, Slovenský raj) and Landscape protection area (Veľká Fatra) and Báb Research Sites. An additional aim of this report is to summarize changes in heavy metal concentrations in mosses in Slovakia between 1990 and 2005 and to summarize concentration of Ag, Al, As, Au, Ba, Br, Ca, Ce, Cl, Co, Cr, Cs, Fe, Hf, I, In, K, La, Mg, Mn, Mo, Na, Ni, Rb, Sb, Sc, Se, Sm, Sr, Ta, Tb, Th, Ti, U, V, W, Yb, Zn, Zr in mosses in Slovakia for 2000.

2. Material and methods

The mosses P. schreberi, H. splendens and Dicranum sp. have been taken in compliance with the international methods (ICP, 1994) in permanent areas situated at the intersection of a 16 x 16 km pan-European network. Moss samples were collected according to the procedures used in deposition surveys in the Scandinavian countries. The collection of samples was performed during the first half of August 1990, 1995, 1996, 1997, 2000 and 2005. The samples consisted of the last three years’ annual segments. Separately, the Vysoké Tatry, Nízke Tatry, Západné Tatry–Jelenec and Slovenský raj National parks, Veľká Fatra in Landscape protection area and the Báb Research Sites were evaluated.

Neutron activation analysis (NAA) was performed in 2000 in the Frank Laboratory of Neutron Physics, Dubna, Russia for 39 elements (Ag, Al, As, Au, Ba, Br, Ca, Ce, Cl, Co, Cr, Cs, Fe, Hf, I, In, K, La, Mg, Mn, Mo, Na, Ni, Rb, Sb, Sc, Se, Sm, Sr, Ta, Tb, Th, Ti, U, V, W, Yb, Zn, Zr). In the laboratory, the samples were carefully cleaned from needles, leaves, soil particles and only the green and green-brown shoots representing the last three years growth were analyzed, after being air-dried to constant weight at 3040 °C for 48 hours. The samples were neither washed nor homogenised. For short-term irradiation samples of about 300 mg were pelletized in simple press forms and heat-sealed in polyethylene foil. For epithermal neutron activation analysis samples prepared in the same manner were packed in aluminium cups for long-term irradiation. The samples were irradiated in the IBR-2 fast-pulsed reactor, in channels equipped with a pneumatic system. The neutron flux characteristics are shown in table 1. Two kinds of analysis were performed: to determine short-lived radionuclides the samples were irradiated for 3 minutes in the second channel (Ch2), and to determine elements associated with long-lived radionuclides samples were irradiated for 100 hours in the cadmium screened Ch1. After irradiation gamma-ray spectra were recorded twice for each irradiation using a high-purity Ge detector: the first one after decay periods of 23 minutes for 5 minutes, and the second one for 20 minutes, 910 minutes after the short irradiation. For long irradiation, samples were repacked into clean containers and measured after 45 days for 45 minutes, and after 2023 days for 3 hours (Frontasyeva, Pavlov, 2000).

Irradiation positionNeutron flux density, [n× cm –2 × s –1]×1012
thermalresonancefast
(E = 0÷0.55 eV)(E = 0.55÷105 eV)(E = 105÷25.106 eV)
Ch1 (Cd-screened)0.0233.34.2
Ch21.232.94.1

Table 1.

Flux parameters of irradiation positions

The atomic absorption spectrometer Varian Techtron was used to determine concentrations of Cd, Cr, Cu, Hg, Ni, Pb and Zn. The elemental analyser LECO SC 132 was applied to determine the concentration of sulphur, and the elemental analyser LECO SP 228 was used to determine the total concentration of nitrogen.

The valid equation [concentration in moss] mg.kg-1 = [4x atmospheric deposition] mg.m-2.year-1was used (Steinnes et al. 2001). The analysis results were interpreted in the form of contamination factors KF as the rates median value of element in Slovak mosses CiSl vs. Norway mosses CiN (KF = CiSl/ CiN). Median Norway value CiN were taken from Steinnes et al. (2001).

The accuracy of data was verified by analysis of standard plant samples and by comparison with the results obtained in 109 laboratories within the IUFRO working group for quality assurance (Hunter, 1994). The QC of NAA results were ensured by analysis of reference materials: trace and minor elements in lichen IAEA-336 (International Atomic Energy Agency), IAEA-SL-1 (Trace elements in lake sediment) and SRM-1633b (Constituent elements in coal fly ash, US NIST-National Institute of Standards and Technology), SRM-2709 (Trace elements in soil). For an assessment of vegetation we used current statistical methods, factor and correlation analysis.

3. Results and discussion

The results of analysing the concentration of 45 elements in the mosses (P. schreberi, H. splendens, Dicranum sp.) are given in Table 2. We present separate loading for Báb Research Sites, National Parks (NP) - Vysoké Tatry; Nízke Tatry; Západné Tatry - Jelenec valley; Slovenský raj, the Landscape protection area (LPA) of Veľká Fatra and for Slovakia. For comparison with a pristine territory the corresponding data for northern Norway (Steinnes et al., 2001) is shown in the left-hand column. Comparison with the limit values from Norway (Table 2) shows strong pollution of the examined areas of Slovakia with most of the elements. However, for Au, N, S and Zr data from Norway was not available.

Excesses of concentrations of elements in mosses in comparison with Norway were expressed by the coefficient of loading by air pollutants KF and classified it into 5 classes; class 1 – elements are in normal standard concentrations and the coefficient does not exceed the value 1; class 2 – light loading (coefficient of loading ranges from 1 to 10); class 3 – moderate loading (coefficient ranges from 10 to 50); class 4 – heavy loading (coefficient ranges from 50 to 100) and class 5 – toxic (coefficient is higher than 100). As shown in Table 3, the coefficient of loading by air pollutants KF for almost all elements is higher than one, excerpt for Au, Br, In, Mg, N, S, Se (Báb); Au, Br, Ca, I, Se (Vysoké Tatry); Au, Br, I, Mg, S, Se, Sm, Ti (Nízke Tatry); Au, Br, Ca, Hg, I, In, Mg, S, Se, Sm (Západné Tatry-Jelenec); Au, Br, In Sm, Se (Slovenský raj) and Au, Br,In Sm (Veľká Fatra).

Spatial trends of element concentrations in mosses were metal-specific. However in general the lowest concentrations were observed in the Nízke Tatry National park, and 10 times higher concentrations occurred in the Vysoké Tatry (Al, Cr, Hf, Sb, Ta, Yb, Zr); Západné Tatry (Cr, Hf, Sb, Yb, Ta, Zr); Slovenský raj (Ag, Hg, Hf, Mo, Pb, Ta, Tb, Yb, Zr ); Veľká Fatra (Cr, Hf, Sb, Ta, Tb, Th, Yb, Zr), Báb (Al, Cd, Ce, La, Hf, Mo, Pb, Sb, Sc, Ta, Tb, Th, Yb, Zr) in comparison to the Norway values. The coefficient of loading by air pollutants KF ranged from 4.2 in the Nízke Tatry to 11.8 in Slovenský raj. Since 1990, the metal concentration in mosses has declined for Cd, Cr, Cu, Fe, Hg, Ni, Pb, Zn (Fig. 1, 2, 3).

Ele-mentBáb
(n=40)
Vysoké Tatry (n=3)Nízke Tatry (n=4)Západné Tatry (n=14)Slovenský Raj (n=5)Veľká Fatra (n=6)Slovakia
(n=86)
Norway
Aver.Exc.Aver.Exc.Aver.Exc.Aver.Exc.Aver.Exc.Aver.Exc.Aver.Exc.Aver.Exc.
Ag0.0214.20.0316.20.0275.40.0336.60.07214.40.0326.40.0387.60.0051
Al96811.088810.13453.97358.47088.07698.796611.0881
As0.216.80.26.70.155.00.186.00.289.30.196.30.26.70.031
Au**0.0010.20.0010.50.0010.50.0010.50.0010.50.0010.50.0010.50.002-
Ba11.32.48.81.88.81.812.52.621.54.5112.315.43.24.81
Br1.160.91.030.80.780.60.850.70.810.60.950.80.910.71.251
Ca19982.67220.910061.31130.110361.314851.913221.77801
Cd0.2010.10.15.00.126.00.157.50.147.00.168.00.168.00.021
Ce1.0412.10.455.20.4635.40.617.10.687.90.778.90.9811.40.0861
Cl531.1681.4992.0801.6741.5521.0701.4501
Co0.286.50.286.60.133.10.348.00.419.40.327.30.388.80.0431
Cr1.649.71.8310.80.84.71.810.61.418.32.3313.72.1812.80.171
Cs0.103.30.134.30.26.70.124.00.113.70.113.70.134.30.031
Cu2.292.12.11.91.61.55.55.04.13.72.11.92.52.31.11
Fe4374.84254.71862.03774.14555.04975.55556.1911
Hf0.16381.50.12864.00.05527.50.13165.50.12562.50.12562.50.16884.00.0021
Hg0.0473.60.0342.60.0322.50.010.80.14711.30.0393.00.1027.80.0131
I0.71.50.30.60.40.80.40.80.71.40.51.00.51.00.501
In0.020.40.051.00.122.40.040.80.040.80.020.40.040.80.051
K19082.523623.122693.019362.617532.316742.217702.47501
La0.7711.00.233.30.324.60.355.00.517.30.588.30.628.90.071
Mg3741.03731.02620.73540.93931.03871.04361.13861
Mn961.21141.4891.11351.61411.7921.11101.3831
Mo0.3110.20.175.70.248.00.289.30.310.00.268.70.279.00.031
N*55001.066421.254941.062681.155201.054071.059271.15638-
Na1202.4811.61072.1821.61092.2901.81292.6501
Ni0.883.10.782.80.381.40.843.00.531.90.983.50.993.50.281
Pb8.612.35.17.345.75.37.612.918.46.39.08.311.90.71
Rb2.851.27.53.093.65.12.13.151.34.131.74.261.72.481
S*4640.94921.04040.84730.95961.25111.05021.0508-
Sb0.1919.30.1717.00.1313.00.220.02.06206.00.2424.00.3838.00.011
Sc0.16511.00.1187.90.0483.20.1057.00.117.30.1439.50.15310.20.0151
Se0.0870.90.080.90.0550.60.080.90.070.80.0981.10.0951.00.0931
Sm0.1151.30.0380.40.0530.60.0510.60.0580.70.070.80.0881.00.0861
Sr22.57.813.54.772.415.85.4144.814.55.021.67.42.91
Ta0.02424.00.01717.00.0088.00.01717.00.01616.00.0220.00.02323.00.0011
Tb0.03030.00.0077.00.0055.00.0110.00.01313.00.01717.00.0220.00.0011
Th0.13313.30.055.00.055.00.088.00.099.00.1111.00.1313.00.0101
Ti9.51.6162.73.80.611.62.09.31.610.31.714.32.45.8751
U0.0287.00.0184.50.0338.30.0256.30.0256.30.0287.00.0358.80.0041
V1.5754.61.133.30.712.11.484.41.243.61.885.51.855.40.341
W0.0782.60.051.70.082.70.072.30.082.70.082.70.072.30.0301
Yb0.09331.00.03812.70.0165.30.03812.70.04314.30.0516.70.06321.00.0031
Zn152.016.32.29.51.3152.0192.611.51.615.42.17.41
Zr**1530.02448.07.515.02040.01632.01734.023.146.20.50-
KF8.86.74.27.011.87.69.51

Table 2.

Atmospheric deposition of elements (average in mg.m-2.rok-1) in Báb Research Sites, Vysoké Tatry, Nízke Tatry, Západné Tatry, Slovenský Raj,Veľká Fatra, Slovakia and Norway calculated from concentration of elements in 3 year old segments of P. schreberi; H. splendens and Dicranum sp. in the year 2000Note: * Slovak median 2000 (Suchara et al. 2007); **Macedonia (Barandovski et al. 2006); Median Norway value (Steinnes et al. (2001); Aver. -Average; Exc. exceedance of element concentrations in mosses comparison with Norway (Central Norway belongs to the least polluted regions in Europe); KF -Coefficient of loading by air pollutants; n- number of Permanent monitoring plots.

The examined Slovak territory shows that many regions have intense mining activity. These are characterized by a high concentration of toxic elements such as As, Al, Mn, Cd, Cr, Cu, Hg, Pb, and Sb. The most significant anthropogenic sources are fossil fuels combustion (electric power stations) located in Upper Nitra, and Vojany. Of the other industrial activities, metallurgy, nonferrous ores processing, and cement factories are also important, such as in Central Spiš, Central Pohronie, and Orava. In Slovakia many pollutant sources overlap which causes difficulty in source identification (Maňkovská, 1996; Suchara et al. 2007; Florek et al. 2008).

SitesContamination factor KFKF
< 11 -1010-5050- 100"/>100
BábAu, Br, In, Mg, N, S, SeAg, As, Ba,Ca, Cl, Co, Cr, Cs,Cu, Fe,Hg, I, K, Mn, Na, Ni, Rb, Sm, Sr, Ti, U, V, W, ZnAl, Cd, Ce, La, Mo, Pb, Sb,Sc, Ta, Tb, Th,Yb, ZrHf8.8
Vysoké TatryAu, Br, Ca, I, SeAg, As, Ba, Cd,Ce, Cl, Co, Cs, Cu, Fe, Hg, In, K, La, Mg, Mn, Mo, N,Na, Ni, Pb, Rb, S, Sc, Se, Sm, Sr, Tb, Th, Ti, U, V, W, ZnAl, Cr, Sb, Ta, Yb,ZrHf6.7
Nízke
Tatry
Au, Br, I, Mg, S, Se, Sm,TiAg, Al, As, Ba, Ca, Cd,Ce, Cl, Co, Cr, Cs, Cu, Fe, Hg, In, K, La, Mn, Mo, N,Na, Ni, Pb Rb, Sb, Sc, Sr, Ta, Tb, Th, U, V, W, Yb, Zn, ZrHf4.2
Západné TatryAu, Br,Ca, Hg, I, In, Mg, S,Se, SmAg, Al, As, Ba, Cd,Ce, Cl, Co, Cs, Cu, Fe, K, La, Mn, Mo, N,Na, Ni, Pb Rb, Sc, Sr, Tb, Th, Ti, U, V, W, ZnCr, Sb, Yb, Ta, ZrHf7
Slovenský rajAu, Br, In Sm, SeAl, As, Ba, Ca, Cd,Ce, Cl, Co, Cr, Cs, Cu, Fe, I, K, La, Mg, Mn, N,Na, Ni, Rb, S, Sc, Sr, Th, Ti, U, V, W, ZnAg, Hg, Mo, Pb, Ta, Tb, Yb, ZrHfSb11.8
Veľká
Fatra
Au, Br,In
Sm
Ag, Al, As, Au, Ba, Ca, Cd,Ce, Cl, Co, Cs, Cu, Fe,Hg, I, K, La, Mg, Mn, Mo, N,Na, Ni, Pb Rb, S, Sc, Se, Sr, Ti, U, V, W, ZnCr, Sb, Ta, Tb, Th, Yb, ZrHf7.6
SlovakiaAu, Br, InAg, As, Ba, Ca, Cd, Cl, Co, Cs, Cu, Fe, Hg, K, La, Mg, Mn, Mo, N,Na, Ni, Rb, S,Sb, Sc, Sm, Sr, Ti, U, V, W, ZnAl, Ce, Cr, Hf, Pb, Sb, Se, Ta, Tb, Th, Yb, Zr9.5

Table 3.

Coefficient of loading by air pollutants KF in the year 2000

In comparison with the 1990 survey (Maňkovská, 1997), the average values in 2005 (Fig.1, 2, 3) for Cd, Cr, Cu, Fe, Hg, Ni, Pb, and Zn were reduced. Decreasing concentrations in Slovakia are connected with the decrease in production of steel and non-ferrous metals, and with the fazing out of leaded gasoline.

Figure 1.

Concentration of Cd, Cr and Cu (in % of average) in mosses for Slovakia in all survey yearsNote: Year (number of PMP): 1990 (58); 1995 (79); 1996 (69); 1997 (74); 2000 (86); 2005 (82) PMP- Permanent monitoring plots

Figure 2.

Concentration of Fe, Hg and Ni (% of average) in mosses for Slovakia in all survey years Note: Year (number of PMP): 1990 (58); 1995 (79); 1996 (69); 1997 (74); 2000 (86); 2005 (82), PMP- permanent monitoring plots

Figure 3.

Concentration of Pb, and Zn (% of average) in mosses for Slovakia in all survey yearsNote: Year (number of PMP): 1990 (58); 1995 (79); 1996 (69); 1997 (74); 2000 (86); 2005 (82), PMP- permanent monitoring plots

This Slovak moss data was subjected to principal component factor analysis (Varimax with Kaiser Normalization). The result of analysis is recorded in Table 4. The 8 factors explain 80% of the total variance in the data set. From the knowledge of the element composition of each factor and the values of factor loadings, the major sources can be identified. Interpretation of 8 factors in the sequence of their significance is as follows:

  • Factor 1 is responsible for 40% of the total variance and it is characterized by the presence of all typical crustal elements. It can be explained by elements associated with mineral particles, mainly windblown dust and it includes 13 elements with Al, Sc, Ti, V, Fe, Zr, Re, Hf, Ta, and Th having loadings higher than 0,9, and the next ten elements (Na, Mg, Cr Co, Ni, Se, Sr, Cs, Ba, and U) have loading factors between 0.70–0.89.

  • Factor 2 is the industrial component, with very high loadings for Cu, Zn, Ag, Sb, Pb and it is responsible for 10% of the total variance with a factor loading from 0.52 to 0.87. The maximum value is in area of Krompachy – Smolnícka Huta – Zlatá Idka. This factor reflects the impact of metallurgical plants.

  • Factor 3 mainly includes Cl, Mn, In and Factor 6 contains K, Rb, and Cs. These elements are likely to be mainly of natural origin.

  • Factor 4 includes As, Cd, Pb and S. The pollution with these metals is most likely caused by the lengthy transport. High levels of precipitation are strongly correlated with the heavy metal deposition, and this seems to be main source of heavy metal fallout at higher altitudes.

  • Factor 5 has Mo and W elements as its main constituents. Their loading constitutes 0.77 of the factor. The factor components originate from engineering and instrument industry located in the towns of: Brezno, Martin, Dubnica, and Košice and in the triangle Stará Turá–Piešťany–Nové Mesto nad Váhom triangle.

  • The major elements in Factor 7 are Ca, I, Br and In. In Slovakia there are 1626 registered mineral water springs of different chemical composition, and a portion of these contain I and Br in adequate quantity.

  • Finally, Factor 8 explains 3% of the total variance, where the dominant element is mercury. Sources of contamination with Hg are related to metal processing industries, combustion fossil fuels and municipal solid wastes and trans-boundary contamination in the NW wind directions.

FactorF1F2F3F4F5F6F7F8
% of cumulative variability43,953,359,864,568,271,474,476,9
Element
Ag0.140.680.150.040.12–0.02–0.20–0.15
Al0.940.060.060.10–0.020.060.18–0.06
As0.170.360.260.610.34–0.040.100.16
Au0.350.320.43–0.050.240.160.02–0.02
Ba0.740.350.29–0.01–0.060.16–0.130.01
Br0.42–0.120.050.290.240.450.330.23
Ca0.28–0.030.080.200.07–0.110.650.11
Cd0.130.21–0.040.760.14–0.080.120.04
Ce0.950.080.08–0.060.100.160.010.06
Cl0.080.080.820.29–0100.20–0.030.14
Co0.840.140.130.010.11–0.040.090.16
Cr0.750.000.240.260.15–0.12–0.03–0.10
Cs0.590.210.36–0.11–0.100.520.000.00
Cu0.150.76–0.030.240.17–0.050.220.18
Fe0.930.140.140.080.040.170.070.02
Hf0.920.060.110.04–0.030.11–0.030.00
Hg0.010.030.110.050.14–0.060.090.85
I0.300.130.100.110.230.050.750.09
In0.020.060.59–0.14–0.140.060.36–0.11
K0.14–0.030.520.110.210.62–0.11–0.09
La0.880.070.03–0.110.230.220.140.07
Mg0.780.130.120.220.010.030.37–0.16
Mn0.380.120.57–0.210.10–0.050.070.20
Mo0.210.21–0.070.260.770.130.13–0.06
Na0.800.030.030.000.200.130.08–0.17
Ni0.840.020.090.110.03–0.180.090.12
Pb0.120.55–0.220.510.15–0.110.27–0.17
Rb0.28–0.030.08–0.180.100.77–0.04–0.03
S0.060.33–0.130.42–0.330.270.180.46
Sb0.090.870.090.05–0.050.06–0.020.06
Sc0.940.080.060.010.080.150.160.01
Se0.850.13–0.030.280.170.100.020.04
Sm0.880.01–0.02–0.060.250.220.100.01
Sr0.84–0.030.110.20–0.10–0.08–0.060.13
Ta0.950.080.090.040.040.110.050.01
Tb0.940.110.05–0.030.120.110.150.09
Th0.940.120.11–0.020.100.190.060.03
Ti0.90–0.010.030.110.020.000.22–0.02
U0.780.100.01–0.050.270.320.24–0.03
V0.900.03–0.060.170.090.000.25–0.03
W0.230.19–0.010.110.770.130.150.22
Yb0.940.100.02–0.020.110.090.030.11
Zn–0.040.520.220.330.28–0.020.200.14
Zr0.930.030.100.060.000.090.06–0.05

Table 4.

WARIMAX rotated PC analysis of the first eight factors on 86 moss samples collected in the territory of Slovakia in 2000Note: Eight main source types were identified. Characteristic elements for the sources types are marked in bold type

4. Conclusion

  • Mosses provide an effective method for monitoring trends in heavy metals pollution in Slovakia at a high resolution;

  • Spatial trends of heavy metal concentrations in mosses were metal-specific. Since 1990, the metal concentration in mosses has declined for cadmium, chromium, cooper, iron, lead, mercury, nickel, and zinc.

  • The coefficient of loading by air pollutants KF for almost all elements is higher than one, excerpt for Au, Br, In, Mg, N, S, Se (Báb); Au, Br, Ca, I, Se (Vysoké Tatry); Au, Br, I, Mg, S, Se, Sm, Ti (Nízke Tatry); Au, Br, Ca, Hg, I, In, Mg, S, Se, Sm (Západné Tatry-Jelenec); Au, Br, In Sm, Se (Slovenský raj) and Au, Br,In Sm (Veľká Fatra), and this is an unfavourable outcome compared to the Norway values. Only the concentration of Au, Br, In, Mg, N, S, Se is lower in Báb Research Sites than relevant Norwegan vakues.

  • This obtained data is useful as a reference level for comparison with the future measurements of air pollution in the examined area and also for biodiversity study. Finally, the significance of transboundary atmospheric transport in this region still remains a subject for future study.

© 2011 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike-3.0 License, which permits use, distribution and reproduction for non-commercial purposes, provided the original is properly cited and derivative works building on this content are distributed under the same license.

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Blanka Maňkovská and Július Oszlányi (September 6th 2011). Method OF INAA for Critical Evaluation Pollution of Ecosystem, Air Pollution - New Developments, Anca Maria Moldoveanu, IntechOpen, DOI: 10.5772/20867. Available from:

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