scholarly journals Annual Behavior of Pesticides in River Waters in Niigata Prefecture

2017 ◽  
Vol 27 (4) ◽  
pp. 183-192
Author(s):  
Miyako TAKAHASHI ◽  
Tsuyoshi IBARAKI ◽  
Akio OZAWA ◽  
Tsukasa TAKAHASHI ◽  
Naoki HATAMOTO ◽  
...  
Keyword(s):  
River Waters ◽  
Niigata Prefecture ◽  
Annual Behavior

scholarly journals Recent tritium levels of river waters and precipitations in Niigata prefecture, Central Japan.

RADIOISOTOPES ◽  
1989 ◽  
Vol 38 (10) ◽  
pp. 434-439 ◽  
Author(s):  
Takao NAKAGAWA ◽  
Osamu SATO ◽  
Tetsuo HASHIMOTO
Keyword(s):  
Central Japan ◽  
River Waters ◽  
Niigata Prefecture

scholarly journals Investigation of Mercury Concentration and Existence Form in River Waters in Niigata Prefecture

2020 ◽  
Vol 30 (0) ◽  
pp. 17-22
Author(s):  
Takashi ONO ◽  
Tomohiro KOBAYASHI ◽  
Ayami MATSUZAKI ◽  
Seiichi TANAHASHI ◽  
Hitoshi MURAYAMA ◽  
...  
Keyword(s):  
Mercury Concentration ◽  
River Waters ◽  
Niigata Prefecture

scholarly journals Oxygen Stable Isotopic Ratios of Precipitations and River Waters in Niigata Prefecture in Recent Years.

RADIOISOTOPES ◽  
2003 ◽  
Vol 52 (2) ◽  
pp. 65-80 ◽  
Author(s):  
Naoki KANO ◽  
Hiroyuki AIHARA ◽  
Ryo KOJIMA ◽  
Kayoko TAKEUCHI ◽  
Akihito SATO ◽  
...  
Keyword(s):  
Isotopic Ratios ◽  
River Waters ◽  
Niigata Prefecture ◽  
Stable Isotopic

CONSIDERATION OF THE VALIDITY OF THE STATISTICAL CHARACTERISTICS OF pH IN SURFACE WATERS

2019 ◽  
Vol 13 (2) ◽  
pp. 52-58
Author(s):  
V. B. Korobov ◽  
I. V. Miskevich ◽  
A. S. Lokhov ◽  
K. A. Seredkin
Keyword(s):  
Field Measurements ◽  
Heavy Precipitation ◽  
The State ◽  
Statistical Characteristics ◽  
Mean Values ◽  
River Waters ◽  
Ph Values ◽  
State Of Water ◽  
Environment Temperature ◽  
Unit Characteristic

Abstract: pH is one of the most important parameters characterizing the state of water systems. The arithmetic mean values of samples are often used when averaging serial pH measurements in water bodies, as is usually done for other characteristics of the state of the natural environment (temperature, salinity, oxygen concentrations, suspended solids, etc.). However, in this case such an operation is illegal, since the addition of logarithms, which by definition are pH, is non-additive. The authors conducted a study to determine the extent to which pH variability in natural objects such an operation would not distort the results. For this, several samples of the pH index were generated in various ranges of its theoretically possible and natural variability. It was established that with pH variability of less than a unit characteristic of marine pH values, the statistical characteristics of the indicator and [H+ ] concentrations differ slightly, and the medians of the samples coincide. It is concluded that with such ranges characteristic of the waters of the oceans, there is no need to recalculate previously obtained results. However, for the estuaries of rivers flowing into tidal seas, as shown by field measurements, the pH variability in the mixing zone of sea and river waters is several times higher. Similar situations may occur when heavy precipitation falls on the water surface, as well as during floods. In these cases, a simple averaging of the pH values will no longer be correct. In such cases, the use of other averaging algorithms and the choice of stable statistical characteristics are required.

Formation of the Ion Composition of the Barguzin River Waters (Lake Baikal Basin) under the Conditions of Saline Landscapes

2020 ◽  
Vol 495 (1) ◽  
pp. 858-861
Author(s):  
V. N. Sinyukovich ◽  
V. G. Shiretorova ◽  
I. V. Tomberg ◽  
L. M. Sorokovikova ◽  
L. D. Radnaeva ◽  
...  
Keyword(s):  
Lake Baikal ◽  
Ion Composition ◽  
River Waters ◽  
Baikal Basin ◽  
Lake Baikal Basin
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