Table 1 KSV value of fluorescence quenching of HA in different systems.

From: Effects of humic acid on Pb2+ adsorption onto polystyrene microplastics from spectroscopic analysis and site energy distribution analysis

system

pH

CHA (mg·C/L)

0.100a (mmol/L)

1.00a (mmol/L)

10.0a (mmol/L)

0.0300b (mmol/L)

0.330b (mmol/L)

3.33b (mmol/L)

HA-Pb2+

3.0

5.00

0.0307

0.0271

0.0253

0.0255

0.0242

0.0192

6.0

5.00

0.259

0.232

0.166

0.207

0.154

0.0880

PSMPs-HA-Pb2+

3.0

1.00

0.0267

0.0230

0.0192

0.0257

0.0213

0.0171

2.50

0.0411

0.0351

0.0294

0.0358

0.0297

0.0227

5.00

0.0611

0.046

0.0367

0.0543

0.0399

0.0316

6.0

1.00

0.138

0.112

0.100

0.123

0.108

0.0815

2.50

0.251

0.224

0.175

0.228

0.183

0.107

5.00

0.379

0.279

0.248

0.306

0.278

0.217

  1. aNaNO3.
  2. bCa(NO3)2.