Processed results from of surface x-ray florescence (XRF) analysis of the sediment grab samples recovered as part of the Long Island Sound mapping project Phase II. Sediment grab samples have been collected in the summers of 2017 and 2018 using a modified van Veen grab sampler. A subsample of the top two centimeter was taken for further lab analysis. Dried and homogenized splits of the samples were analyzed for chemical composition using an Innov-X Alpha series 4000 XRF (Innov-X Systems, Woburn, MA). The results of the measurements are presented as ppm. The XRF analytical protocol included the following elements: P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn As, Se, Br, Rb, Sr, Zr, Mo, Ag, Cd, Sn, Sb, I, Ba, Hg, Pb, Bi, Th, and U. However, only Cl, K, Ca, Ti, Cr, Mn, Fe, Co, Cu, Zn, As, Br, Rb, Sr, Zr and Pb were consistently present at levels above background detection in surficial sediments collected in the LIS Phase II area. The data are presented as Excel spreadsheet.

Time period of content: 2017-08-01 to 2022-11-16

Attribute accuracy: The attribute accuracy varies by element and is measured as +/- 1 standard variation

Completeness: The dataset is mostly complete. A few samples had too little material to perform regular and acid-treated samples.

Positional accuracy: Locations are based on DGPS using the ship GPS antenna for most cores resulting +/- 5 m accuracy.

Attributes:

Sample_ID: Text describing the Name of the grab sample, a combination of survey ID and grab sample number.

Short_name: Text describing just the grab number, but without the survey ID

Latitude: Latitude of grab sample station

Longitude: Longitude of grab sample station

P: measured Phosphate content in ppm

P_err: uncertainty of Phosphate measurement

S: measured Sulfate content in ppm

S_err: uncertainty of Sulfate measurement

Cl: measured Chloride content in ppm

Cl_err: uncertainty of Chloride measurement

K: measured Potassium content in ppm

K_err: uncertainty of Potassium measurement

Ca: measured Calcium content in ppm

Ca_err: uncertainty of Calcium measurement

Ti_Leap: measured Titanium content in ppm

Ti_L_err: uncertainty of Titanium measurement

Ti: measured Titanium content in ppm

Ti_err: uncertainty of Titanium measurement

V: measured Phosphate content in ppm

V_err: uncertainty of Phosphate measurement

Cr_LEAP: measured Phosphate content in ppm

Cr_L_err: uncertainty of Phosphate measurement

Cr: measured Phosphate content in ppm

Cr_err: uncertainty of Phosphate measurement

Mn_Leap: measured Phosphate content in ppm

Mn_L_err: uncertainty of Phosphate measurement

Mn: measured Phosphate content in ppm

Mn_err: uncertainty of Phosphate measurement

Fe_Leap: measured Phosphate content in ppm

Fe_L_err: uncertainty of Phosphate measurement

Fe: measured Phosphate content in ppm

Fe_err: uncertainty of Phosphate measurement

Co: measured Phosphate content in ppm

Co_err: uncertainty of Phosphate measurement

Ni: measured Phosphate content in ppm

Ni_err: uncertainty of Phosphate measurement

Cu: measured Phosphate content in ppm

Cu_err: uncertainty of Phosphate measurement

Zn: measured Phosphate content in ppm

Zn_err: uncertainty of Phosphate measurement

As: measured Phosphate content in ppm

As_err: uncertainty of Phosphate measurement

Se: measured Phosphate content in ppm

Se_err: uncertainty of Phosphate measurement

Br: measured Phosphate content in ppm

Br_err: uncertainty of Phosphate measurement

Rb: measured Phosphate content in ppm

Rb_err: uncertainty of Phosphate measurement

Sr: measured Phosphate content in ppm

Sr_err: uncertainty of Phosphate measurement

Zr: measured Phosphate content in ppm

Zr_err: uncertainty of Phosphate measurement

Mo: measured Phosphate content in ppm

Mo_err: uncertainty of Phosphate measurement

Ag: measured Phosphate content in ppm

Ag_err: uncertainty of Phosphate measurement

Cd: measured Phosphate content in ppm

Cd_err: uncertainty of Phosphate measurement

Sn: measured Phosphate content in ppm

Sn_err: uncertainty of Phosphate measurement

Sb: measured Phosphate content in ppm

Sb_err: uncertainty of Phosphate measurement

I: measured Phosphate content in ppm

I_err: uncertainty of Phosphate measurement

Ba: measured Phosphate content in ppm

Ba_err: uncertainty of Phosphate measurement

Hg: measured Phosphate content in ppm

Hg_err: uncertainty of Phosphate measurement

Pb: measured Phosphate content in ppm

Pb_err: uncertainty of Phosphate measurement

Bi: measured Phosphate content in ppm

Bi_err: uncertainty of Phosphate measurement

Th: measured Phosphate content in ppm

Th_err: uncertainty of Phosphate measurement

U: measured Phosphate content in ppm

U_err: uncertainty of Phosphate measurement