It can be seen from Table 1 that the correlation coefficient value of Mg^{2+} and Ca^{2+} is 0.893, and the correlation coefficient value of and Na^{+} is 0.967, indicating that there is a strong correlation between some variables. The correlation coefficient values of and Na^{+}, are 0.403 and 0.389, respectively, and the correlation coefficient values of Cl^{−} and Mg^{2+} is 0.213, indicating that some variables had moderate correlations. According to different PCA dimensions, the cumulative contribution rate of extracted principal components is shown in Table 2.

Table 2

Element . | Initial eigenvalues . | Extract the load sum of squares . | ||||
---|---|---|---|---|---|---|

Total . | Percent variance . | Cumulation % . | Total . | Percent variance . | cumulation % . | |

Ca^{2+} | 4.123 | 51.532 | 51.532 | 3.864 | 48.301 | 48.301 |

Mg^{2+} | 1.685 | 21.061 | 72.592 | 1.694 | 21.169 | 69.470 |

Na^{+} | 1.092 | 13.649 | 86.242 | 1.342 | 16.772 | 86.242 |

0.486 | 6.074 | 92.316 | ||||

0.377 | 4.708 | 97.024 | ||||

Cl^{−} | 0.171 | 2.138 | 99.163 | |||

PH | 0.062 | 0.781 | 99.943 | |||

TH | 0.005 | 0.057 | 100.000 |

Element . | Initial eigenvalues . | Extract the load sum of squares . | ||||
---|---|---|---|---|---|---|

Total . | Percent variance . | Cumulation % . | Total . | Percent variance . | cumulation % . | |

Ca^{2+} | 4.123 | 51.532 | 51.532 | 3.864 | 48.301 | 48.301 |

Mg^{2+} | 1.685 | 21.061 | 72.592 | 1.694 | 21.169 | 69.470 |

Na^{+} | 1.092 | 13.649 | 86.242 | 1.342 | 16.772 | 86.242 |

0.486 | 6.074 | 92.316 | ||||

0.377 | 4.708 | 97.024 | ||||

Cl^{−} | 0.171 | 2.138 | 99.163 | |||

PH | 0.062 | 0.781 | 99.943 | |||

TH | 0.005 | 0.057 | 100.000 |

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