Semi-Quantification of the Calcium Carbonate in Marine Sediments by Visible and Near-Infrared Diffuse Reflectance Spectroscopy

Cao, Wei1; Liu, Qingsong1,2; Jiang, Zhaoxia3,4,5; Zhong, Yi1; Gai, Congcong1; Wang, Haosen1; Wang, Dunfan1

2024-04-01

10.1029/2023GC011370

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS   影响因子和分区

1525-2027

["As one of the most widespread components in marine sediments, calcium carbonate (CaCO3) plays a crucial role in the global carbon cycle and climate changes. To efficiently semi-quantify the CaCO3 concentration, a more effective, non-destructive, economic, and accurate technique is required. Diffuse reflectance spectroscopy (DRS) has been widely used for the detection and quantification of minerals but has been less studied for CaCO3. This study synthesized a series of samples with well-determined content of CaCO3 to analyze the visible and near-infrared DRS characteristics. Results show that the intensity of the second derivative of Kubelka-Munk (K-M) remission functions of the DRS spectra at 2,340 nm (I2340) is linearly correlated with the CaCO3 content. Then, the new proxy I2340 was applied for marine sediments from the Pacific Ocean with known CaCO3 concentrations determined previously by chemical methods, and the robustness of the I2340 as the proxy for CaCO3 concentration was attested.","Calcium carbonate (CaCO3) is one of the most common components in marine sediments, and its content variations (precipitation and dissolution) play an important role in global environmental change and paleoclimate evolution. However, previous quantitative methods such as chemistry and X-ray diffraction cannot simultaneously achieve efficiency, accuracy, and environmental protection. To solve the above problems, this study established a new proxy using visible and near-infrared diffuse reflectance spectroscopy (DRS) technology that can detect calcium carbonate content in a fast, non-destructive, economic, and eco-friendly way. The verification results from synthetic standard samples and natural marine sediment samples indicate that the new DRS proxy can well reflect the variations in calcium carbonate content, which is more targeted for calcium carbonate with less interference compared with the traditional brightness proxy. Overall, this study provides a promising method for precisely quantifying calcium carbonate in marine sediments.","CaCO3 exhibits a significant absorption in the near-infrared band between 2,300 and 2,400 nm A new spectral proxy I2340 is proposed to quantify marine sedimentary CaCO3 content I2340 is more accurate in quantifying marine sedimentary CaCO3 than traditional brightness proxy"]

calcium carbonate marine sediments visible and near-infrared diffuse reflectance spectroscopy (DRS)

SCI ; EI

英语

第一 ; 通讯

Shenzhen Science and Technology Program["KQTD20170810111725321","KCXFZ20211020174803005"] ; State Key Laboratory of Marine Geology, Tongji University[MGK202209] ; null[92158208] ; null[41922026] ; null[42261144739] ; null[42274094] ; null[42204080] ; null[42176066]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001193319600001

AMER GEOPHYSICAL UNION

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Ctr Marine Magnetism CM2, Dept Ocean Sci & Engn, Shenzhen, Peoples R China
2.Laoshan Lab, Lab Marine Geol, Qingdao, Peoples R China
3.Ocean Univ China, Coll Marine Geosci, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Key Lab Submarine Geosci & Prospecting Tech, Qingdao, Peoples R China
4.Laoshan Natl Lab, Lab Marine Geol, Qingdao, Peoples R China
5.Laoshan Natl Lab, Lab Marine Mineral Resources, Qingdao, Peoples R China

Cao, Wei,Liu, Qingsong,Jiang, Zhaoxia,et al. Semi-Quantification of the Calcium Carbonate in Marine Sediments by Visible and Near-Infrared Diffuse Reflectance Spectroscopy[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2024,25(4).

Cao, Wei.,Liu, Qingsong.,Jiang, Zhaoxia.,Zhong, Yi.,Gai, Congcong.,...&Wang, Dunfan.(2024).Semi-Quantification of the Calcium Carbonate in Marine Sediments by Visible and Near-Infrared Diffuse Reflectance Spectroscopy.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,25(4).

Cao, Wei,et al."Semi-Quantification of the Calcium Carbonate in Marine Sediments by Visible and Near-Infrared Diffuse Reflectance Spectroscopy".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 25.4(2024).